InterviewSolution
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InterviewSolution
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Shown in the figure is a system of three particles of mass `1 kg, 2 kg` and `4 kg` connected by two springs. The acceleration of `A. B` and `C` at any instant are `1 ms^(-2), 2 ms^(-2)` and `1//2 ms^(-2)` respectively directed as shown in the figure external force acting on the system isA. `1N`B. `7N`C. `3N`D. none of these |
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Answer» Correct Answer - C The aceeleration of centre of mass of the system `a_(cm)=(|m_(1)veca_(1)=vecm_(2)a_(2)+m_(3)veca_(3)|)/(m_(1)+m_(2)+m_(3))` `implies` the net force acting of the system `=|m_(1)veca_(1)+vecm_(2)a_(2)+m_(3)veca_(3)|` `implies F_(net)=(m_(1)a_(1)+m_(2)a_(2)-m_(3)a_(3))` `=[(1)(1)+(2)(2)-1/2(4)]N=3N` |
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