PhysicsHard63×since 2002Q6222A particle of mass m with an initial velocity ui^u\widehat iui collides perfectly elastically with a mass 3 m at rest. It moves with a velocity vj^v\widehat jvj after collision, then, v is given by :Av=23uv = \sqrt {{2 \over 3}} uv=32uBv=u3v = {u \over {\sqrt 3 }}v=3uCv=u2v = {u \over {\sqrt 2 }}v=2uDv=16uv = {1 \over {\sqrt 6 }}uv=61uCheck answerSkip