Physics

Problem

An ice puck of mass

0.20\,\text{kg}

moves with speed

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

towards an identical stationary puck on a perfectly smooth surface. After a perfectly elastic impact, the stationary puck moves off making an angle of

40^{\circ}

with the original line of motion of the first puck. The speed of the first puck just after the collision is a)

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

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

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

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

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