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Work done in time t on a body of mass m which is accelerated from rest to a speed v in time 1 t as a function of time t is given by

1. 2 1 2 1 t t v m
2. 2 1 t t v m
3. 2 2 1 2 1 t t v m        
4. 2 2 1 2 2 1 t t v m

Correct answer: 2 2 1 2 2 1 t t v m

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