A block slides to the right at on a smooth surface while a block moves to the left at

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

5\,\text{kg}

block slides to the right at

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

on a smooth surface while a

1\,\text{kg}

block moves to the left at

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

. They collide head-on and the collision is perfectly elastic. The speed of the

1\,\text{kg}

block immediately after the collision is (a)

-5.3\,\text{m\,s}^{-1}

(b)

+5.3\,\text{m\,s}^{-1}

(c)

+1.2\,\text{m\,s}^{-1}

(d)

-6.3\,\text{m\,s}^{-1}