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Physics - Center of Mass Question with Solution | TestHub

PhysicsCenter of MassMomentum conservationMedium3 minQB

PhysicsMediumsingle choice

A particle of mass m and momentum $P$ moves on a smooth horizontal table and collides directly and perfectly elastically with a similar particle (of mass m) having momentum $- 2 P$ . The loss (-) or gain (+) in the kinetic energy of the first particle in the collision is

Options:

Answer:

Solution:

Equal masses, elastic: velocities are exchanged.

First particle: $p / m \to - 2 p / m$ .

$Δ K_{1} = (2 p)^{2} /2 m - p^{2} /2 m = + 3 p^{2} /2 m$ (gain). Answer C.

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

⏱ 3mℹ️ Source: QB

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