3. A stone is dropped from rest from a point 125 meters from the ground. Find: (a). its velocity when it falls on the ground. (b). the time it takes the stone to reach the point 80 meters above the ground.
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- You throw a baseball directly upward at time t=0 at an initial speed of 12.3 m/s. What is the maximum height the ball reaches above where it leaves your hand? Ignore air resistance and take ?=9.80 m/s2.If an object is thrown straight up and air resistance is negligible, then its speed when it returns to the starting point is the same as when it was released. If air resistance were not negligible, how would its speed upon return compare with its initial speed? How would the maximum height to which it rises be affected?You throw a baseball directly upward at time t=0 at an initial speed of 12.1 m/s. What is the maximum height the ball reaches above where it leaves your hand? Ignore air resistance and take g=9.80 m/s2 At what times does the ball pass through half the maximum height?
- An object is thrown upwards with a speed of 14 m/s. How long does it take to reach a height of 5.0 m above the projection point while descending? Neglect air resistance.A lead ball is dropped into a lake from a diving board 6.20 m above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 4.80 s after it is released. How deep is the lake?3) A ball is projected upward at time t = 0.0 s, from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 36.2 m/s if air resistance is negligible. The time when the ball strikes the ground isclosest to A) 0 s B) 8.7 s C) 9.4 s D) 10 s E) 9.7 s
- Dodoy is a professional stuntman who has from a cliff. What should be his minimum speed as he leaps from the edge of the cliff so that he will land on a soft cushion below which is 15 m from the base of the cliffWhat happens if the person on the cliff throws the rock straight down, instead of straight up? To explore this question, calculate the velocity of the rock when it is 5.10 m below the starting point, and has been thrown downward with an initial speed of 13.0m/s.A ball is shot from the ground straight up into the air with initial velocity of 50 ft/sec. Assuming that the air resistance can be ignored, how high does it go?
- A skier is gliding along at 3.1 m/s on horizontal, frictionless snow. He suddenly starts down a 10∘ incline. His speed at the bottom is 13 m/s What is the length of the incline? How long does it take him to reach the bottom?A baseball player throws a baseball straight up into the air, in the following way: Starting from a height of 1.0 m above the ground, he accelerates the ball vertically with 30. m/s2 for 0.25 s, then the ball leaves his hand and flies straight up in free fall. Let’s ignore the air resistance. Draw a carefully labeled sketch of the situation. Calculate the velocity of the ball as it leaves the player’s hand. How high does the ball go relative to its initial position (yo=1.0 m)? Shows all work please.A person throws a ball upward into the air at an initial velocity of 15.0 m/s. Calcate the time (t) the ball passes a point 8.0 m above the thrower's hand.