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Questions  

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 and
all collisions are elastic, the velocity of sphere 4 iust after collision is
 

a
(2gl)
b
(3gl)
c
(gl)
d
(gl)/2

detailed solution

Correct option is A

. 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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