Question

A boy throws a ball straight up with a speed of 21.5 m/s. The ball has a mass of 0.19 kg. How much gravitational potential energy will the ball have at the top of its flight? (Assume there is no air resistance.)

Answer 1

Answer:43.9 J ✊the Right answer

Answer 2

So first you have to determine what the maximum height of the object will be.
21.5-9.8t=0
This equation will give you the time at which the ball hits max height
t= 2.194 sec
So now use the time and plug it in to the velocity equation so 21.5•2.194= 47.171
So the max height is 47.171 which we can use for the gravitational potential energy
The weight (.19) times the height (47.171) is 8.96249 and that is the answer