A child and sled have a combined mass of 60 kg. The child starts from rest at the top of a 4 m high hill and slides down the hill. Ignoring friction, what is the child's speed

Q: If a 0.50 kg ball is moving at a speed of 12 m/s what is the kinetic energy of the ball? Equation is…

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Q: It takes 165 k] of work to accelerate a car from 21.0 m/s to 27.5 m/s. What is the car's mass? kg

A: Given data The work required is given as W = 165 kJ. The initial velocity is given as u = 21 m/s.…

Q: A body of 4.5 Kg is dropped from rest at a height of 10.5 m. What is the speed immediately before it…

A: Write the given values of the problem- Mass of the body(m) m=4.5 kg height(h) h=10.5 m

Q: How much work is needed to stop a 1330 kg car that is moving straight down the highway at 15 m/s?

A: Given: mass of the car (m) = 1330Kg            Initial speed of the car (u) = 15 m/s…

Q: A roller-coaster car has a mass of 500 kg when fully loaded with passengers (a) If the car has a…

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Q: Shoebill storks are very large birds that can take flight. A particular Shoebill flies through the…

A: Given, Speed=10m/s, Kinetic energy=300J, Let mass of shoebill is m kg

Q: A package with a mass of 40.0 kg slides down a smooth ramp with negligible friction. The package…

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Q: A woman runs up a flight of stairs. The gain in her gravitational potential energy is 1000 J. If she…

A: The gain in gravitational potential energy is given as 1000 J.

Q: A two-man bobsled has a mass of 390 kg. Starting from rest, the two racers push the sled for the…

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Q: A 75kg- bicyclist starts from rest at the top of a hill and rolls down the hill without pedaling.…

A: Write the value of height of the hill.   h=49 m   Here, the initial speed of the bicyclist is zero…

Q: A two-man bobsled has a mass of 350 kg. Starting from rest on a level road, the two racers push the…

A: Given data: -  The mass of the bobsled is m = 350 kg. The net force on the bobsled is F = 290 N.…

Q: compact car can climb a hill in 10 s, the top of the hill is 30 m higher than the bottom, and the…

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Q: The work done in pushing a TV set a distance of 2 m with an average force of 5 N is A) 25J . B) 10…

A: If F force has been applied  on an object that has r displacement. then work don on the object  W =…

Q: The work done in pushing a TV set a distance of 3 m with an average force of 10 N is A) 3 J.…

A: Given data:  Distance (d) = 3 m Force (F) = 10 N Required: Work (W)

Q: An automobile has a power output of 100 hp. When it pulls a cart with a force of 300N, what is the…

A: Answer:-  Given  Power (P) = 100 hp        (1hp = 746 watt)   P = 100 × 746 watt  P = 74600 watt…

Q: A cart which has a mass of 20 kilograms slides down a frictionless slope of a hill. If the cart…

A: Given value--- mass = 20 kg. speed at bottom = 15.6 m/s. We have to find --- height?

Q: A roller coaster starts from rest at its highest point and then descends on its (frictionless)…

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Q: A bodybuilder lifts a 150 kg barbell to a height of 3.0 m.  What is the work done by the bodybuilder…

A: The potential energy is given by  U = m g h  where, m is the mass,  g is the gravity and h is the…

Q: What is the work done by the rocket on the sled? Answer in joules (J) with 4 significant figures.

A: Force by a rocket on sled= 400.0 N distance covered by sled when force was applied by rocket= 2.000…

Q: A dart of a mass of 20 g hits a target while traveling horizontally with a velocity of 5 m/s. The…

A: The mass of the dart ,m=20 g=20×10-3 kg The initial velocity of the dart u=5 m/s The distance…

Q: An automobile has a power output of 1 hp. When it pulls a cart with a force of 300N, what is the…

A: Let the force is denoted by F and the power is denoted by P.

Q: A 25 kg object is raised a distance of 1.2 m above the ground. How much kinetic energy will the…

A: In this question, we have been given that an object is raised till a height of 1.2 meters, this…

Q: A force of 120 N is used to lift a 10 kg box to a height of 5.0 m. If the box started from rest what…

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Q: A weightlifter picks up a 826 N weight and picks it up to a height of 1.4 meters. It takes him 1.2…

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Q: A car is moving with a kinetic energy of 80 J and is slowed down and stopped in a distance of 0.05…

A: Given data The kinetic energy of the car is KEi = 80 J. The final velocity of the car is zero as it…

Q: is the final speed?

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Q: A car of mass 2086 kg travelling at a speed of 21 m/s has the same kinetic energy as a 2985 kg…

A: Given mass of car m = 2086 kg speed of car v=21 m/s mass of truck M=2985 kg we know kinetic energy…

Q: A ball of mass 8.59 kg moving with speed 0.81 m/s hits a wall and bounces back with speed 0.21 m/s…

A: Given : m = 8.59 kg vi = 0.81 m/s vf = -0.21 m/s (negative because ball bounces back and moves in…

Q: Car A has a mass of 1000 kg and a speed of 60 km/hr and car B has a mass of 2000 kg and a speed of…

A: We know kinetic energy KE=0.5mv2 where m is mass v is speed

Q: A chain is held on a frictionless table with one fourth hanging over the edge. If the chain has a…

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Q: At what speed does a 1000 kg compact car have the same kinetic energy as a 20,000 kg truck going 25…

A: Given: The mass of car is 1000 kg. The mass of truck is 20000 kg. The speed of car is 25 km/h.

Q: A dog with a mass of 57.0 kg slides down a wet slope with negligible friction. The dog starts from…

A: Given: Mass of dog m=57 kg Initial velocity u =0 m/s Final speed v=2.10 m/s

Q: A railroad locomotive accelerates a 95,000-kg railcar from 10 m/s to 25 m/s in 90 seconds. What was…

A: The initial velocity u=10 m/s The final velocity v=25 m/s Mass of the locomotive m=95000 kg The…

Q: A 2000 kg car can accelerate from rest to 50 m/s in 4.2 seconds. How much power does the engine…

A: The initial speed of a car is, u=0 m/s The final speed of a car is, v=50 m/s The car's mass is,…

Q: How much work is done by 2 kg fish that changes its speed from 1 m/s to 3 m/s

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Q: A 5 25 kg rock has 350 J of kinetic energy as it hits the ground. How fast is it moving? Your answer

A: Mass of rock (m) = 5.25 kg kinetic energy of rock as it hits the ground (K) = 350 J

Q: A girl and her bicycle have a total mass of 40.0 kg. At the top of the hill her speed is 5.0 m/s,…

A: Concept:        The work energy theorem says that           work done by all the forces= change in…

Q: he graph shows the potential energy (in units of J) of a of a system. The object moves along the…

A: We know total mechanical energy of the system is always conserved. Here we have to calculate kinetic…

Q: kinetic energy

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Q: A two-man bobsled has a mass of 290 kg. Starting from rest, the two racers push the sled for the…

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Q: A professor’s little car can climb a hill in 10 s. The top of the hill is 30 m higher than the…

A: Mass  , m = 1000 kg  Height of hill , H = 30 m Time required , T = 10 s To find = power output of…

Q: A 10 kg cat climbs a tree to a height of 8.2 meters. What is the gravitational potential energy of…

A: Mass (m) = 10 kg Height (h) = 8.2 m Gravity (g ) = 9.80 m/s2 .........(constant)

Q: If it took 40 J of energy to push a crate 4 m across the floor, how much force was being applied to…

A: Date given ,  Work done ( W ) = 40 J Displacement ( d ) = 4 m Here , The push is in the same…

Q: A 12 kg package in a mail sorting room is released with an initial speed of 3 m/s and slides a total…

A: Given information: Here, m is the package’s mass, vi is the package’s initial velocity, s is the…

Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.