A block of mass m is stationary with respect to the wedge of mass M moving with uniform speed v on horizontal surface. Work done by friction force on the block in t seconds is
A
zero
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Since block doesn't move with respect to edge, so friction force should balance the component of weight
along the inclined plane. 
Component of displacement along the inclined plane in time t is given by 
Work done by f =-mg sin 
cos 
vt
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