certain force acting on a 20kg mass change its velocity from 5ms to 2ms .calculate the work done by the forge
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Answer:
210Joule
Explanation:
Mass = m = 20 kg
Initial velocity = u = 5 ms
Final velocity = v = 2ms
Work done = Kinetic energy = K= 0.5*mv^2 - 0.5*mu^2
= 0.5*m*(u^2-v^2)
=0.5*20*(5^2-2^2)
=0.5*20*(25-4)
=0.5*20*21
= 210 Joule
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