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A railway truck of mass 4000 kg moving at 3 m/s collides with a stationary truck of mass 2000 kg. The couplings join and the trucks move off together. Calculate their common velocity after collision.

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m1u1 + m2u2 =(m1 + m2)
4000 x 3 + 0= 6000v
v= 2m/s

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