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Physics - Center of Mass Question with Solution | TestHub

PhysicsCenter of MassMotion of centre of massMedium2 minQB

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A non-zero external force acts on a system of particles. The velocity and acceleration of the centre of mass are found to be $v_{0}$ and $a_{C}$ respectively at an instant t. It is possible that :-

(i) $v_{0} = 0, a_{C} = 0$

(ii) $v_{0} \neq = 0, a_{C} = 0$

(iii) $v_{0} = 0, a_{C} \neq = 0$

(iv) $v_{0} \neq = 0, a_{C} \neq = 0$

Options:

Answer:

Solution:

Non-zero external force means $a_{C} = \frac{F _{e x t}}{M} \neq = 0$ at every instant, so (i) and (ii) are impossible.

The velocity $v_{0}$ may momentarily be zero or non-zero. So (iii) and (iv) are possible. Hence (A).

Stream:JEESubject:PhysicsTopic:Center of MassSubtopic:Motion of centre of mass

⏱ 2mℹ️ Source: QB

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