SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When a racket hits a ball, energy is transferred from the racket’s kinetic energy store to the ball’s kinetic energy store. This energy is transferred ____
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____ by heating.
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____ electrically.
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____ mechanically.
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None of the above
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Explanation:
Detailed explanation-1: -As the ball rises, kinetic energy is transferred to potential energy as the ball slows down and gets to be further from the ground. When the ball reaches its peak height all of its energy is in the form of potential energy, which as the ball begins to fall back down, coverts into kinetic energy as the ball speeds up.
Detailed explanation-2: -The ball slows down, deforms temporarily and shoots back up. The air in the ball acts like a spring-it gets compressed and expands again. During the collision, some of the ball’s energy is converted into heat. As a consequence, the ball shoots up with less energy than it had when it reached Earth.
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