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A plank of mass M is placed over smooth ...

A plank of mass `M` is placed over smooth inclined plane and sphere is also placed over the plank. Friction is sufficient between sphere and plank. If plank and sphere are released from rest, the frictional force on sphere is -
.

A

up the plane

B

down the plane

C

zero

D

maybe up or down the plane

Text Solution

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The correct Answer is:
C
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