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2014-09-13T11:42:58+05:30

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Using law of conservation of momentum
m₁=50g = 50/1000 kg
v₁=35m/s
m₂=4kg
m₁v₁=m₂v₂
50/1000 x 35 = 4v₂
v₂=0.4375m/s 
0
m2 is 4kg
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