Q. A particle falls from rest under gravity. Its potential energy with respect to ground and its kinetic energy are plotted against time . Choose the correct graph:

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A

B

C

D

Solution:

As a particle falls its gravitational potential energy decreases and kinetic energy increases with speed given as so the possible option is (B).

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5. A ball of mass collides with a wall with speed and rebounds on the same line with the same speed. If mass of the wall is taken as infinite, the work done by the ball on the wall is

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