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Standard XII

Physics

The 'e' Equation

A ping - pong...

Question

A ping - pong ball strikes a wall with a velocity of $10 m s^{- 1}$ . If the collision is perfectly elastic. Find the velocity of ball after impact ?

- 20 m s^{- 1}

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- 5 m s^{- 1}

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1.0 m s^{- 1}

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- 10 m s^{- 1}

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Solution

The correct option is A $- 10 m s^{- 1}$
Coefficient of restitution, $e = \frac{0 - V}{10 - 0}$
As collision is perfectly elastic, $e = 1$
$\Rightarrow V = - 10 m / s$

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A ping - pong ball strikes a wall with a velocity of 10 ms−1. If the collision is perfectly elastic. Find the velocity of ball after impact ?

The correct option is A −10 ms−1Coefficient of restitution, e=0−V10−0As collision is perfectly elastic, e=1⇒V=−10 m/s

A ping - pong ball strikes a wall with a velocity of $10 m s^{- 1}$ . If the collision is perfectly elastic. Find the velocity of ball after impact ?

The correct option is A $- 10 m s^{- 1}$
Coefficient of restitution, $e = \frac{0 - V}{10 - 0}$
As collision is perfectly elastic, $e = 1$
$\Rightarrow V = - 10 m / s$