Question

The velocity of a body of mass 10kg increases from 4 m/s to 8m/s when force acts on it for 2 seconds. find

a.what is the momentum of the body before the force acts.

Answer 1

Initial velocity (u) = 4 m/s

Final velocity (v) = 8 m/s

Mass (m) = 10 kg

Time (t) = 2 seconds

Initial momentum (p₁) = m × u

Final momentum (p₂) = m × v

(a) 

Momentum before the force act = Initial momentum 

                                              = m × u

                                              = 10 × 4

                                              = 40 kg.m/s

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