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CBSE Class 11-science Answered

A swimmer can swim in still water at a rate of 4kmph. If he swims in a river flowing at 3kmph and keeps his direction with respect to water perpendicular to the current, find his velocity and direction with respect to the ground?
Asked by | 28 Sep, 2012, 03:55: PM
answered-by-expert Expert Answer
velocity of swimmer wrt ground: v = 4 kmph
velocity of river wrt ground: u = 3kmph
angle between his velocity and river: 90 degrees
thus relative velocity of that swimmer in water wrt ground: (u2 + v2)1/2= 5 kmph
and angle  is given as: tan-1(3/4)
Answered by | 30 Sep, 2012, 09:55: PM

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