Question

6. What is the kinetic energy of the ball as it is half way through the fall?

(: Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls to the ground. Think about the amounts of potential and kinetic energy the bowling ball has:
• as it sits on top of a building that is 40 meters tall.
• as it is half way through a fall off a building that is 40 meters tall and travelling 19.8 meters per second.
• as it is just about to hit the ground from a fall off a building that is 40 meters tall and travelling 28 meters per second

Answer 1

Step-by-step explanation:

It is given that halfway through the fall, the speed of the ball is

v' = 19.8 m/s

The kinetic energy of the ball is given by

where

m = 2 kg is the mass of the ball

v' = 19.8 m/s is its speed

Substituting, we find the kinetic energy when the ball is halfway through the fall:

KE=1/2(2)(19.8)^2392J