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A ball of mass m made of playdough moves with speed v. Another ball, of the same mass, chases the first one with the speed 2v

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Answer #1

Let the combined velocity be V m/s

By the conservation of momentum

initial momentum = final momentum

m1u1 + m2u2 = (m1 + m2)*V

mv + m*2v = (m + m)V

V = 3v/2

so final velocity is 3v/2

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