InterviewSolution
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InterviewSolution
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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 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 beA. `3kg`B. `5kg`C. `7kg`D. `12kg` |
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Answer» Correct Answer - b Here, From `vec(p_(1)) + vec(p_(2)) + vec(p_(3)) = 0` `vec(p_(3)) = - (vec(p_(1)) +vec(p_(2)))` `|vec(p_(3))| = |vec(p_(1)) + vec(p_(2)) | =sqrt(p_(1)^(2) + p_(2)^(2))` `sqrt((1xx12)^(2) + (2xx8)^(2)) =20` `m_(3) = (|vecp_(3)|)/(upsilon_(3)) = (20)/(4) =5kg` . |
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