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=10ms−2.
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 C20cm Given, m=0.5kg,W=1J,g=10ms−2 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