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4. When two forces act on a body,in opposite directions along straight line. One of the forces should be. _the other to change the state of motion of a body.​

Answer»

☞It is CALLED unbalanced force... Unbalanced force: When two opposite forces acting on a BODY move a body in the direction of the greater force or change the STATE of rest, such forces are called as unbalanced force. Frictional force: The force that always opposes the MOTION of object is called force of FRICTION....Explanation:Hope it may helps u...



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