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The velocity of a body of mass 10 kg inc...

The velocity of a body of mass 10 kg increases from 4 m/s to 8 m/s when a force acts on it for 2 s
(a) What is the momentum before the force acts?
(b) What is the momentum after the force acts ?
(c ) What is the gain in momentum per second ?
(d) what is the value of the force ?

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