22. Give one example to show that the sum of
potential energy and kinetic energy remains
constant if friction is ignored.
23. A ball is made to fall freely from a height. State
the kind / kinds of energy possessed by the ball
when it is
(a) at the highest point
(b) just in the middle
(c) at the ground.
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Answer:
During the vertical fall of ball, it friction due to air is neglected, the total sum of potential energy and kinetic energy at each point of its path remains same.
Explanation:
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