CBSE Class 9 Answered

You should know the following formulae

Momentum p = mv.

Kinetic energy ,K = 1/2mv² = p²/2m

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1. Two bodies have different masses, say one is m and the other is M.

Their momenta are equal so mV = Mv

The smaller mass should have larger V for the momenta to be equal.

2. Use formula K = p² /2m;

K for larger mass is p² /2M

K for smaller mass is p² /2m.

As p is the same for both masses, the object with larger mass will have lesser kinetic energy.