An ice puck of mass moves with speed towards an identical stationary puck on a…

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

Problem

An ice puck of mass 0.20 kg0.20\,\text{kg} moves with speed 6 m s−16\,\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∘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 m s−16.0\,\text{m s}^{-1} (b) 4.6 m s−14.6\,\text{m s}^{-1} (c) 3.9 m s−13.9\,\text{m s}^{-1} (d) 2.3 m s−12.3\,\text{m s}^{-1}

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