Question

A tennis ball is hit into the air with a racket. When is the ball’s kinetic energy the greatest? Ignore air resistance. when it leaves the racket just before it reaches the ground when it reaches its maximum height when its kinetic energy and potential energy are equal just before it starts falling downward.

Answer 1

Answer:

just before the ball reaches the ground

Answer 2

Answer;

just before it reaches the ground

Explanation;

• Kinetic energy is the energy possessed by a body or an object in motion.
• Kinetic energy is given by 1/2mv², where m is the mass of the object and V is the velocity of the body. Thus, kinetic energy depends on the velocity of the body if mass is kept constant.
• As soon as the ball leaves the racket it has more kinetic energy and zero potential energy. As it moves up its velocity decreases, and thus the kinetic energy is being converted to kinetic energy up to maximum height reached where kinetic energy will be zero since the velocity is zero.
• When the ball is going down the potential energy will be converted to kinetic energy up to a point just before it hits the ground, where kinetic energy is maximum since the velocity of the ball is maximum, due to gravitational acceleration.