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Question

A block B is pushed momentarily along a horizontal surface with an initial velocity v. If μ is the coefficient of sliding friction between B and the surface, block B will come to rest after a time.
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A
vgμ
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B
gμv
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C
gv
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D
vg
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Solution

The correct option is A vgμ
Friction force of the block will be, F=μmg
So retardation will be, a=Fm=μg
Using: v=u+at
We get, t=vμg

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