Question

A body of mass 5kg has linear momentum of 20kgm/s. If a constant force of 5N acts on it in the direction of its motion for 10s. The change in kinetic energy of the body is

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Answer 1

Answer:

Initial velocity (u) = 20/5 = 4m/s

acceleration = f/m = 1m/s

final velocity (v) = u + at = 4+1(10) = 14

So,change in kinetic energy = 1/2m(v2 - u2) =

1/5(5)(196-16) = 496 J

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