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A man who can swim at the rate of 2km/hr, crosses a river to an exactly opposite point on the other bank by swimming in a direction of 120 degree to the flow of the water in the river. The velocity of the water current in km/hr is __ ??
ans 1km/hr
let v be the velocity of water
then v= Vm* cos 60
2*1/2=1 km/h
look
he can swim will always mean velocity of man relative to river .
Vmr = Vm - Vr
taking components -
Vmrcos120 = Vmcos90 - Vrcos0
2*(-1/2) = -Vr
SO , Vr = 1 km/hr
plz like my answer
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