A 6 kg mass travelling at $2.5 m s^{- 1}$ collides head on with a stationary 4 kg mass. After the collision the 6 kg mass travels in its original direction with a speed of $1 m s^{- 1}$ . The coefficient of restitution is

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1 / 2

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Solution

The correct option is B $1 / 2$
$e = \frac{v - 1}{2.5}$
$= \frac{1.25}{2.5} = \frac{1}{2}$

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