You are rowing a boat north on a river at the rate of 4km/hr. The current of the river is moving east at 3km/hr. What is the resultant velocity of boat?
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The speed of a boat relative to the water is equal to the speed of boat in still water. The velocity of a boat relative to the water (→vb/w v → b / w ) is equal to the difference in velocity of the boat relative to the ground (→vb v → b ) and velocity of water relative to the ground (→vw v → w ) i.e., →vb/w=→vb−→vw.
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