Question

introduce 1st law from second law of motion

Answer 1

By newton's second law of motion,

F=ma......(1)

When a=0;

Sigma F =0

Therefore,

SigmaF(x)=0 &sigmaF(y)=0

Which, concludes that if a body is un-accelerated then the net external force on the body is zero.

Hence,

Every body continues to be in its state of rest or of uniform motion in straight line unless compelled by some external force to act otherwise.

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