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
v/(gμ)
b
gμ/V
c
g/V
d
V/g
answer is A.
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Detailed Solution
Friction is the retarding force for the block F=ma=μmgRetardation a=μgFrom first equation to motion v=u−at⇒0=V−μg×t⇒t=Vμg
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