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A body of mass 20g projected vertically upwards in vacuum re...

A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms-2]. Determine the potential energy of the body at the maximum height of its motion

A.

0.36J

B.

0.72J

C.

360.00J

D.

720.00J

Correct answer is A

P.E at max = K.E on projection

= 12mv2 = 12×0.02×62=0.36J