31. A body having a mass 100 gram is allowed to fall freely from a height 1000 m under the action of
gravity. Its kinetic energy after 10 seconds is (take
= 1000 cm/sec)
(a) 5 joules
(b) 50 joules
(c) 500 joules
(d) 5000 joules

Pls give step by step ans​

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