[" 194.A plank of mass "m" moving with "...

[" 194.A plank of mass "m" moving with "],[" a velocity "v" along a frictionless "],[" horizontal track and a body of "],[" mass "m/2" moving with "2v" collides with plank elastically."],[" Final speed of the plank is: "],[[" (a) "(5v)/(3)," (b) "(3v)/(3)],[" (c) "(2v)/(2)," (d) none of these "]]

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[" 194.A plank of mass "m" moving with "],[" a velocity "v" along a frictionless "],[" horizontal track and a body of "],[" mass "m/2" moving with "2v" collides with plank elastically."],[" Final speed of the plank is: "],[[" (a) "(5v)/(3)," (b) "(3v)/(3)],[" (c) "(2v)/(2)," (d) none of these "]]

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