What is a force? What changes can be produced by a force? (
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Answer : Force is a physical (magnitude + direction) quantity which is represented as a ratio of change in momentum divided by change in time and is generally told as, force is a push or a pull that can change the state of the motion or can change the shape of the object on which force is applied.

that would be because of both gravity and friction. so     c

i already answered it by 34/s