In free space,a shell moving with velocity 60 | vedclass

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(B) According to the law of conservation of linear momentum,if the external force acting on a system is zero,the velocity of the centre of mass remain

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$60$

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(B) According to the law of conservation of linear momentum,if the external force acting on a system is zero,the velocity of the centre of mass remains constant.In this problem,the shell is moving in free space,meaning there are no external forces acting on it $(F_{ext} = 0)$.Therefore,the velocity of the centre of mass before the explosion is equal to the velocity of the centre of mass after the explosion.Given initial velocity $v_{cm} = 60\,m/s$.Thus,the velocity of the centre of mass after the explosion remains $60\,m/s$.

In free space,a shell moving with velocity $60\,m/s$ along the positive $x$-axis explodes into two pieces of mass ratio $1:2$ when it passes through the origin. After the explosion,the velocity of the centre of mass is ........ $m/s$.

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