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An explosion blows a rock into three par...

An explosion blows a rock into three parts. Two parts go off at right angles to each other . These two are `1 kg` first part moving with a velocity of `12 ms^(-1) and 2 kg` second part moving with a velocity of `8 ms^(-1)`. If the third part flies off with a velocity of `4 ms^(-1)`. Its mass would be

A

`5 kg`

B

`7 kg`

C

`17 kg`

D

`3 kg`

Text Solution

Verified by Experts

The correct Answer is:
A
Resultant momentum of two parts is
` sqrt((1 xx 12)^(2) + ( 2 xx 8)^(2)) = 20 kg m//s`
`20 = m xx 4 rArr m = 5 kg`
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