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Question

Find the vertical height through which a body of mass 0.5kg is lifted if the energy spent in doing so is 1.0J. Consider g=10ms2.

A
30cm
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B
40cm
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C
20cm
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D
50cm
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Solution

The correct option is C 20cm
Given, m=0.5kg,W=1J,g=10ms2
Energy spent in lifting the body is stored as potential energy of the body.
U=1J
Let the vertical height be h.
U=mgh
or, 1=0.5×10×h
or, h=10.5×10=0.2m=20cm

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