Two identical balls bearing in contact with each other and resting on a frictionless table are hit head on by another ball bearing the same mass moving initially with a speed v as shown in figure. If the collision is elastic, which of the following (figure) is a possible result after collision? [NCERT Exemplar]

Question

Infinity Learn · Accepted Answer

When two bodies of equal masses collide elastically, their velocities are interchanged.When ball $$1$$ collides with ball $$2$$, then velocity of ball $$1$$, $$v1becomes$$ zero and velocity of ball $$2$$, $$v2$$ becomes v, i.e.                          $$v1$$ $$=$$ $$0$$  and $$v2$$ $$=$$ vSimilarly, when ball $$2$$ collides with ball $$3$$ , $$v2$$ $$=$$ $$0$$ and $$v3$$ $$=$$ v.Also in elastic collision both momentum and energy remain conserved .Hence, figure (2) is correct.

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