If fig four identical spheres of equal mass m are suspended by wires of equal length $$/$$, so that all spheres are almost touching to each other. If the sphere $$1$$ is released from the horizontal position andall collisions are elastic, the velocity of sphere $$4$$ iust after collision is

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If fig four identical spheres of equal mass m are suspended by wires of equal length $$/$$, so that all spheres are almost touching to each other. If the sphere $$1$$ is released from the horizontal position andall collisions are elastic, the velocity of sphere $$4$$ iust after collision is

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. When the sphere $$1$$ is released from horizontal position, then potential energy at height $$/$$ $$=$$ kinetic energy at bottomor $$mgl=12mv2$$ $$v=(2gl)Now$$, the velocity of sphere $$1$$ is transforred to sphere $$2$$ felastic $$collision)$$, then from $$2$$ to sphere $$3$$ and finally from sphere $$3$$ to sphere $$4$$ Therefore, the sphere $$4$$ attains "  velocity  (2gl)

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