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Q.

A ball of mass m, moving with a velocity u, along X-axis, strikes another ball of mass 2m kept at rest. The first ball comes to rest after collision and the other breaks into two equal pieces. One of the pieces starts moving along the y-axis with a speed V. The velocity of the other piece is

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a

u2+V2

b

V - u

c

V2-u2

d

u + V

answer is D.

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Detailed Solution

From LCM,

mui^+0=0+mVj^+mv3→

v3→=ui^-Vj^⇒v3→=u2+V2

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