A body of mass 10 kg projected vertically upward from the ground has potential energy 580 joules and kinetic energy 1380 joules at a certain point in its path. The velocity of projection of the body must be
A
16.6ms−1
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B
19.8ms−1
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C
14ms−1
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D
10.8ms−1
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Solution
The correct option is A19.8ms−1 K.E at point of launch = total M.E. (since these as no P.E at launch) =580+1380 (since there is no non-conservation force, so ME is conserved)