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which of the following statement is corr...

which of the 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 is 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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