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Question

The direction of Kinetic friction at the given instant
1) On the block, exerted by the ground
2) On the ground, exerted by the block


A
Forward, Forward
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B
Forward, Backward
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C
Backward, Forward
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D
Backward, Backward
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Solution

The correct option is C Backward, Forward
Kinetic Friction opposes relative slipping. It acts opposite to the direction of relative velocity.

Frictional force on the block exerted by the ground

Hence frictional force on the block by ground is backward

Frictional force on the ground exerted by the block

and frictional force on the ground by block is forward.

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