# Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.

Kinetic energy, K.E. = 20 J (given);

Mass, m = 100 g = 0.1 kg (given)

And Momentum (p) =?

We know that, K.E. = 1/2 mv2

20 = 1/2 x 0.1 x v2

40 = 0.1 x v2

400 = v2

v = 20

Therefore, v=20m/s

Momentum (p) = mv

p = 0.1 kg x 20 m/s

p = 2 kg m/s

Therefore, momentum = 2kgm/s

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