7a. A ball is dropped from the roof of a 23 m tall building. What is the velocit

Question

7a. A ball is dropped from the roof of a 23 m tall building. What is the velocity of the object when it touches the ground? velocity 7b. Suppose that the ball is a perfect golf ball, and it bounces such that the velocity as it leaves the ground has the same magnitude but the opposite direction as the velocity with which it reached the ground. How high will the ball bounce? height reached 7c. Now suppose instead that the ball bounces back to a height of 19 m. What was the velocity with which it left the ground? velocity

Explanation / Answer

7a) v = -sqrt(2*g*h) = -sqrt(2*9.8*23) = -21.23 m/s

"-" indicates downward direction.

7b) same height, h = 23 m

7c) v = sqrt(2*g*h)

= sqrt(2*9.8*19)

= 19.3 m

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