certain force acting on a 20kg mass changes it's velocity from 5ms^-1 to 2ms^-1. Calculate the work done by the force.
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Work done = chane in K.E.
So , 1/2 m(v2^2-v1^2)
WD= 210
So , 1/2 m(v2^2-v1^2)
WD= 210
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