A smooth steel ball P (mass m) slides on a frictionless horizontal table with a speed…

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

Problem

A smooth steel ball P (mass m) slides on a frictionless horizontal table with a speed of 6 m s⁻¹ towards an identical stationary ball Q. The collision is perfectly elastic. After impact, ball P is observed to move at 30° above its original line of motion. What is the speed of ball P immediately after the collision? (a) 6 m s−16\,\text{m s}^{-1} (b) 3 m s−13\,\text{m s}^{-1} (c) 5.2 m s−15.2\,\text{m s}^{-1} (d) 6.9 m s−16.9\,\text{m s}^{-1}

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