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Velocity of boat will be 0.35 metre per second by applying conservation of momentum.
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842abhinavkumar:
answer is option 4 less than 0.35
yes because water and boat friction is neglected. air and boat friction is also there. that's why it will be less than 0.35
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As there is no external force applied, momentum of system will remain conserved.
Initial momentum = final momentum
⇒ (5)(14)=(140+60)(V), finally system (boat + person) will move with velocity V.
This gives V=0.35m/s.
Now since air and boat friction is present thus velocity would be <0.35m/s
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