At a place where the acceleration due to gravity is 10 m sec−2 a force of 5 kg-wt acts on a body of mass 10 kg initially at rest. The velocity of the body after 4 second is:

We know g=10 m/s2, F=5 kg-wt=50 N, M=10 kg, Initial velocity u=0
Acceleration a = F/M = 50/10 = 5m/s<sup>2</sup>
v=0+5(4) = 20 m/s

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