Question

A body of mass 15 kg is moving with a velocity of 36 km/h. It hits
another body of mass 3 kg at rest. The two bodies combine &
move with velocity V. What is the value of V in km/h.​

Answer 1

Answer:

30kmph

Explanation:

using the law of conservation of momentum:

m1u1+m2u2=m1v1+m2v2

We will not be using the conventional units for the ease of calculation

15kg×36kmph+3kg×0kmph = 540kgkmph

now when the masses are joined:

18kg×v=540kgkmph

v=540kgkmph÷18kg

v=30kmph.

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