A railway engine of mass 10000kg moving with velocity of 2 m/sec collides a wagon of 20000 kg at rest .After collision both move with the same velocity.find the common velocity?
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m1u1 +m2u2=m1v1+m2v2
10000×2 + 0=v×{10000+20000}
V=10000×2/30000
V=2/3 m/s
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