Question

which law gives us the measurement of force

Answer 1

the law which states the measurement of force is Newton's second law of motion

Answer 2

Second law of motion states that : the rate of change of momentum is directly proportional to to the force acting and takes the direction in which force acts 

Now, 

consider a body has Mass 'm', moving with a initial velocity 'u', so it initial momentum will be mu.now suppose that the bory stops in time t,then its final momentum would be mv/t 

 

force is directly proportional to (mv-mu) /t

Force = m x a 

SI unit of force is Newton(N).
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