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Which of following statement is correct?...

Which of following statement is correct?

A

The normal reaction and gravitational force on a body placed on a surface are action-reaction

B

The direction of friction force on a body placed on a rough surface always opposite to applied force

C

The normal force on a body placed on a rough surface is always equal to weight of the body

D

A body, in motion, may not be acted upon by a force

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