Block A of mass is moving at along a smooth

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

Block A of mass

2\,\text{kg}

is moving at

6\,\text{m s}^{-1}

along a smooth, straight track and overtakes block B of mass

4\,\text{kg}

that is moving in the same direction at

2\,\text{m s}^{-1}

. The blocks collide head-on and the collision is perfectly elastic. What is the speed of block A just after the collision? (a)

1.33\,\text{m s}^{-1}

(b)

0.67\,\text{m s}^{-1}

(c)

3.33\,\text{m s}^{-1}

(d)

6.0\,\text{m s}^{-1}