Fun with Resultant Vectors...
A river flows at 3 m/s and is 300 m wide. A man swims across the river with a velocity of 2 m/s directed always perpendicular to the flow of current.
Calculate: (A) The total time taken ( in minutes) by man to cross the river? (B) How far down the stream ( from the starting point ) does he reach the opposite bank of the river ( in metre ) ?
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1 solution
velocity of the man across the river is 2m/s and the distance traveled is 300m therefore the time taken is 150 sec =2.5 min.
velocity of the man along the river is 3 m/s therefore he travels 450 meters in 150 sec.