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  4. A body of mass 1 kg collides head on elastically with a stationary body of mass 3 kg. After collision, the smaller body reverses its direction of motion and moves with a speed of 2 m / s. The initial speed of the smaller body before collision is ms -1

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Q. A body of mass $1 \,kg$ collides head on elastically with a stationary body of mass $3\, kg$. After collision, the smaller body reverses its direction of motion and moves with a speed of $2\, m / s$. The initial speed of the smaller body before collision is ___ $ms ^{-1}$

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Solution:

Correct answer is '4'

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