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Physics - Center of Mass Question with Solution | TestHub

PhysicsCenter of MassMomentum conservationMedium2 minPDF

PhysicsMediummultiple choice

Two particles, P of mass 2 m and Q of mass m , are subjected to mutual force of attraction and no other force acts on them. At $t = 0, P$ is at rest at point O and Q is moving away from O with a speed 5 u . At a later instant $t = T$ (before any collision has taken place), Q is moving towards O with speed u . Then

Options:(select one or more)

Answer:

B, D

Solution:

$P_{ini t ia l} = 5 m u$

$P_{Q} (T) = - m u$

$P_{P} (T) = 6 m u$

Total kinetic energy changes from $\frac{25}{2} m u^{2}$ to $\frac{37}{2} m u^{2}$

$W = 3 m u^{2}$

Thus B is correct and D follows the paper sign convention.

Stream:JEESubject:PhysicsTopic:Center of MassSubtopic:Momentum conservation

⏱ 2mℹ️ Source: PDF

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