2. A rock is thrown straight upwards (air resistance is negligible). At its highest point, what can you say about the acceleration? A) The acceleration is upwards. B) The acceleration is downwards. C) The acceleration is zero. D) The acceleration reverses from upward to downward. E) The acceleration reverses from downward to upward.

Q: 1) A baseball pitcher makes a big mistake and throws the ball straight up. If it reaches a maximum…

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Q: 7. A car and a jeep are 7 km apart. The car starts from rest and travels towards the jeep with an…

A:

Q: Does acceleration depend on the speed of an object? Why or why not? Give an example of a slow object…

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Q: A car was about to hit a cat and the driver suddenly hit the brakes, leaving a skid mark 50m long on…

A: Given : Length of skid mark, s = 50 m Initial velocity = Velocity with which the car was moving = u…

Q: 8. A ball is thrown vertically upward. (a) What are its velocity and acceleration when it reaches…

A: Given A ball is thrown vertically upward .

Q: 2. If you throw a rock straight up in the air with a velocity of 29.5 m/s, how high does it go and…

A: At highest point final velocity will be zero. Apply kinematics formula, v=u+at Initial speed u=29.5…

Q: 5) An object falls from a building which is 1200 meters high. How long before it hits the ground if…

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Q: 2. Calculate the uniform acceleration of a tricycle, which a. starts from rest and reaches a speed…

A:

Q: 1. An airplane accelerates down a runway at 3.20 m/s? for 32.8 seconds until is finally lifts off…

A: The kinematics equation can be used to find the unknown distance, time, and velocity. The three…

Q: 1. What is the average speed of a cheetah that sprints 100 m in 4 s? How about if it sprints 50m in…

A: average speed=total distance total time for 100 m in 4s average speed=1004=25 m/s

Q: 1. A bus starts from rest at a station and accelerates at a rate of 2 m/ s^2 for 15 sec. It then…

A: Given data: Initial velocity (v0) = 0 m/s Acceleration (a)  = 2 m/s2 Time (t) = 15 s Then constant…

Q: 2. The brakes of a car are applied, causing it to slow down at a rate of 10 feet per square second.…

A:

Q: On Earth, how far will an object fall in 1 minute? Ignore air resistance. Assume the object is high…

A:

Q: 6. A car travels along a straight line at a constant speed of AMT 60.0 mi/h for a distance d and…

A: (a) The constant speed for the first distance  is 60 mih  , and average velocity of the car during…

Q: 1. You toss a ball straight upward, in the positive direction. The ball falls freely under the…

A: Given that:- Concept of kinematics is applied in all three questions.

Q: 1. A particle traveling in a straight line starts from rest it has an acceleration of a=B°t2+ct, if…

A: Since you have asked multiple questions only the first question is solved for you. If you want any…

Q: 4. You want to determine the acceleration of a bird flying initially at 20 meters per second and…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: 1. On a highway, the driver applies the brakes when he sees rocks on the road due to a landslide.…

A:

Q: 1. A toy rocket rises from the ground with a constant upward acceleration of 5 m/s2 for 6 seconds…

A:

Q: 2. An object on one of the moons of Jupiter is dropped from rest. If the object covers a distance of…

A: distance covered (d) = 3.2 mtime taken (t)= 1.5 s initial velocity (u) = 0 ms

Q: 2. Tyler bungee - jumped from a bridge above the Corinth Canal in Greece. The rope he used was 76.0…

A: Given: Initial velocity = vi = 0 m/s Displacement = length of rope = s = 76 m Acceleration = a = g =…

Q: 5. A child throws a ball straight up in the air, which then falls and bounces off the floor. The…

A: #5 From the given figure following quantity can be observed: The initial velocity is u=4 m/s. The…

Q: 6. How does an object Position vs. Time Velocity vs. Time Acceleration vs. Time move to create a…

A: We can solve this question conceptually.  Let us consider we are observing at origin, +x is our…

Q: 1. The graph shows the vertical velocity of a particle during the first 20 seconds of its movement.…

A: a) during first 10 seconds,the final velocity at 10 sec is V10 = 60m/sthe initial velocity of…

Q: 2. A car at the initial speed of 5 m/s is being uniformly accelerated to a speed of 15 m/s for 5…

A: As per our guidelines  we are supposed to answer only one question. Kindly repost other question as…

Q: A bullet fired into a tree trunk strikes it with an initial velocity of 300 m/s. If the bullet…

A: Given : Initial velocity of the bullet, u =300 m/s Final velocity of the bullet, v = 0 m/s Distance…

Q: A motorist drives north for 37.0 minutes at 76.5 km/h and then stops for 15.0 minutes. He then…

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Q: 12 A paratrooper is initially falling downward at a speed of 30.0 m/s before her parachute opens.…

A:

Q: 3) A commercial airplane accelerates on a runway in Newark International airport at a rate of 3.20…

A: The expression for the travelled distance,

Q: A potato gun is 1.5 m long and it shoots a potato straight up in the air.  When the potato launches…

A: Given:- The length of the potato gun is L = 1.5 m  When the potato lunch from the gun. it has a…

Q: 17. An object falls from a high building. Ignoring air resistance, what will its velocity be after 6…

A: When an object freely fall from the top of the building than the initial velocity of the object…

Q: 5. A cat walking to the right at 2.0 m/s spies a mouse and begins chasing the mouse with a constant…

A:

Q: 3. What is happening to the velocity of an object if it has a negative acceleration? it is…

A: Acceleration is the rate of change of velocity.

Q: 1. In which of the following situation ? does the car have westward acceleration? a. The car travels…

A: Given a car have westward acceleration and we have to chose the correct situation regarding to…

Q: 2. Jennie throws the ball straight downward, letting it bounce before catching it. How can you…

A:

Q: 2 A small steel ball, dropped from rest, takes 0.50 s to fall through a vertical distance of 1.25 m.…

A:

Q: 3. Which of the following statements about free fall acceleration on Earth is accurate? O It is only…

A: The acceleration due to gravity is nothing but the acceleration of an object experienced by an…

Q: 2. In order to take off, a 747 jetliner must reach a takeoff speed of approximately 95.0 m/s. If a…

A: Given: Initial speed,u=0 (as start from rest) Final speed, v=95.0 m/s Uniform acceleration, a=2.20…

Q: 1. A police car at rest is passed by a car travelling at 120 km/h. Three seconds after the car…

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Q: Victor is driving south. He is travelling at 12 m/s, when he enters an area with a new speed limit.…

A: 1.

Q: 1) A baseball pitcher makes a big mistake and throws the ball straight up. If it reaches a maximum…

A: Please note : As per answering guidelines I can answer the first three questions of  a multisub-part…

Q: 2. If you throwa rock straight up in the air with a velocity of 29.5 m/s, how high does it go and…

A: At the highest point, velocity of the rock will become zero.

Q: 7. If the vehicle velocity changes from 0-60mph in 4.2 s, Calculate the average acceleration when…

A: 7)  Change in velocity = 60mph = 60* 1.60934  = 63.66 Kmph t = 4.2 s = 4.2/3600 = 1.167*10-3 h…

Q: A ball is thrown with an initial upward speed of 25 m/s.    ( g =9.81 m/s2) 1. What is the velocity…

A:

Q: 11. A truck covers a distance of 40.0 meters in 8.50 seconds while smoothly slowing down to a speed…

A:

Q: 9) Two objects move with initial velocity 28.00 m/s, final velocity 16.0 m/s, and constant…

A: (a) From kinematic equation, vf2-vi2=2ax    [1] Thus, the acceleration will be, a=vf2-vi22xa=16…

Q: 5. With what velocity must a stone be thrown vertically upward to reach a maximum height of 50m? How…

A: The stone is thrown vertically upwards, so the final velocity of the stone is zero,  Use the third…

Q: 3. A person starts pedaling a bicycle from rest, and accelerates uniformly over a time of 7.34…

A: The distance traveled by bicycle is, s=35 m The time taken by bicycle to travel the distance is,…

Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.