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Physics - Center of Mass Question with Solution | TestHub

PhysicsCenter of MassMomentum conservationMedium3 minQB

PhysicsMediummultiple choice

A ball A collides elastically with an another identical ball B with velocity 10 m/s at an angle of 30° from the line joining their centres $C_{1}$ and $C_{2}$ . Select the correct alternative(s).

Options:(select one or more)

Answer:

A, B, C

Solution:

Equal masses exchange the line-of-centres component: B gets $10 cos 3 0^{\circ} = 53 m / s$ - (B) true. A keeps only the perpendicular component $10 sin 3 0^{\circ} = 5 m / s$ - (A) true. A moves perpendicular and B along the line of centres, so they move at 90° - (C) true. The collision is elastic, so KE is conserved - (D) false. Answer: (A), (B), (C)

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

⏱ 3mℹ️ Source: QB

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