An explosion blows a rock into three parts. Two parts go off at right angles to each other . These two are $1 k g$ first part moving with a velocity of $12 m s^{- 1} and 2 k g$ second part moving with a velocity of $8 m s^{- 1}$ . If the third part flies off with a velocity of $4 m s^{- 1}$ . Its mass would be

3kg

5kg

7kg

17kg

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An explosion blows a rock into three parts. Two parts go off at right angles to each other . These two are

1 k g

first part moving with a velocity of

12 m s^{- 1} and 2 k g

second part moving with a velocity of

8 m s^{- 1}

. If the third part flies off with a velocity of

4 m s^{- 1}

. Its mass would be

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