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Standard IX

Physics

Conservation of Momentum

Two solid rub...

Question

Two solid rubber balls, A and B having masses 200 and 400 g respectively are moving in opposite directions with velocity of A equal to $0.3 m / s$ . After collision the two balls come to rest, then the velocity of B is-

0.15 m / s

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1.5 m / s

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- 0.15 m / s

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None of the above

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Solution

The correct option is C $- 0.15 m / s$
By law of conservation of momentum
$0.2 \times 0.3 + 0.4 u = 0$ or $u = - 0.15 m / s$

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Two solid rubber balls, A and B having masses 200 and 400 g respectively are moving in opposite directions with velocity of A equal to 0.3m/s. After collision the two balls come to rest, then the velocity of B is-

The correct option is C −0.15m/sBy law of conservation of momentum 0.2×0.3+0.4u=0 or u=−0.15m/s

Two solid rubber balls, A and B having masses 200 and 400 g respectively are moving in opposite directions with velocity of A equal to $0.3 m / s$ . After collision the two balls come to rest, then the velocity of B is-

The correct option is C $- 0.15 m / s$
By law of conservation of momentum
$0.2 \times 0.3 + 0.4 u = 0$ or $u = - 0.15 m / s$