A girl of mass 50 kg jumps out of a boat of mass 300 kg with horizontal velocity of 3 m/s. With what velocity does the boat begin to move backwards ?

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## Shrestha

m_{1}= 50 kgv_{1}= 3 m/sm_{2}= 300 kgv_{2}= ?momentum of girl = momentum of boatm_{1}v_{1}= m_{2}v_{2}or, 50 x 3 = 300v_{2}or, 150 = 300v_{2}or,^{150}/_{300}= v_{2}or, v_{2}= 0.5 m/s