Q.

A solid sphere of mass 1Kg , radius 10 cm rolls down an inclined plane of height 7m. The velocity of its centre of mass (inms1 ) as it reaches the ground level is __________.

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answer is 10.

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Detailed Solution

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v=1+2ghk2R2For a solid spherek2R2=25
Substituting the given values, we get v=2×10×7(1+25)=10ms1

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A solid sphere of mass 1Kg , radius 10 cm rolls down an inclined plane of height 7m. The velocity of its centre of mass (in ms−1 ) as it reaches the ground level is __________.