A tennis ball is hit into the air with a racket. When is the ball’s kinetic energy the greatest? Ignore air resistance.
A.
when it leaves the racket
B.
just before it reaches the ground
C.
when it reaches its maximum height
D.
when its kinetic energy and potential energy are equal
E.
just before it starts falling downward
Answers
Answer:
B. just before it reaches the ground
Explanation:
it is so because when the ball is about to reach the ground the kinetic energy is maximum . kinetic energy is basically about its movement its velocity so when the racket is being thrown up it is moved from potential energy to kinetic energy. The racket was stable when it was just thrown and the racket suddenly gained velocity and when it is reaches the maximum height it was at rest at that height for a few seconds so in the maximum height it will be in the potential energy. when the racket will be falling down it will have both Kinetic and potential energy because the potential energy which was at the maximum height will slowly change into kinetic energy and when it will be about to touch the ground it will have maximum kinetic energy