a man of mass m= 70kg stands on one end of a flatboat which is always moving horizontally without friction of at a speed v=5m/s over water the boat has a mass M=210kg and length L=20m the man starts to walk to the other end in the direction of the boats motion with a relative speed v= 2m/s what is the velocity of the centre of mass after the man starts walking with a relative speed v = 2m/s

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