A tennis player climbs up onto the roof of a building (8 5m high) to throw the ball down If the ball has a mass of 150 g and the player throws the ball with an initial speed of 5 5 m s find a) the initial gravitational potential energy of the ball when he throws it b) the initial kinetic energy of ...

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A tennis player climbs up onto the roof of a building (8.5m high) to throw the ball

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A tennis player climbs up onto the roof of a building (8.5m high) to throw the ball down. If the ball has a mass of 150 g and the player throws the ball with an initial speed of 5.5 m/s find:
a) the initial gravitational potential energy of the ball when he throws it.
b) the initial kinetic energy of the ball when he throws it.
c) the final speed of the ball just before it hits the ground.
d) the kinetic energy of the ball when it has dropped to a height of 5.0 m above the ground.