A bomb at rest explodes into two pieces of masses $20 k g$ and $30 k g$ . If the first one moves with a velocity of $30 m s^{- 1}$ . Find the velocity of the other ?

- 20 m s^{- 1}

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0.5 m s^{- 1}

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+ 20 m s^{- 1}

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0.3 m s^{- 1}

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Solution

The correct option is A $- 20 m s^{- 1}$
Using momentum conservation:
$50 \times 0 = 30 \times v + 30 \times 20$
$\Rightarrow v = - 20 m / s$

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A bomb at rest explodes into two pieces of masses 20 kg and 30 kg. If the first one moves with a velocity of 30ms−1. Find the velocity of the other ?

The correct option is A −20 ms−1Using momentum conservation:50×0=30×v+30×20⇒v=−20 m/s

A bomb at rest explodes into two pieces of masses $20 k g$ and $30 k g$ . If the first one moves with a velocity of $30 m s^{- 1}$ . Find the velocity of the other ?

The correct option is A $- 20 m s^{- 1}$
Using momentum conservation:
$50 \times 0 = 30 \times v + 30 \times 20$
$\Rightarrow v = - 20 m / s$