A body of mass 2 kg is thrown up vertically with K.E. of 490 Joules. If the acceleration due to gravity is 9.8 m/s2 , then the height at which the K.E. of the body becomes half its originalvalue is given by
A
50m
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B
12.5m
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C
25m
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D
10m
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Solution
The correct option is B12.5m
Let h is that height at which the kinetic energy of the body becomes half its original value i.e.
Half of its kinetic energy is converted into potential energy