A heavy steel ball of mass greater than 1 kg moving with a speed of 2 $m s e c^{- 1}$ collides head-on with a stationary ping-pong ball of mass less than 0.1 g. The collision between them was elastic. After the collision the ping-pong ball moves approximately with a speed of

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Toppr Admin · Accepted Answer

Since the body is much heavy these won-apos-t be much change in velocity -amp- e-1i-e- v-x2212-20-x2212-2-x2212-1-x21D2-v-4m-s

A heavy steel ball of mass greater than 1 kg moving with a speed of 2m/ s collides head on with a stationary ping pong ball of mass less than 0.1 g. The collision is elastic. After the collision the ping pong ball moves approximately with a speed4m/s2×103m/s2×104m/s2m/s

Since the body is much heavy these won't be much change in velocity & e=1i.e., v−20−2=−1⇒v=4m/s

Since the body is much heavy these won't be much change in velocity
& $e = 1$

i.e., $\frac{v - 2}{0 - 2} = - 1$

$\Rightarrow v = 4 m / s$