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.)

Question

anonymous · Answer

The definition of gravitational potential energy is

$$ U = mgh $$

To find the maximum height of the ball, you need to use an equation of motion that only uses initial velocity, final velocity (at the top of the ball's trajectory it will have a final velocity of 0m/s) acceleration and distance.  

Then use the maximum height as the "h" value in the gravitational potential equation.