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38.Apersonaiming to reach the exactly opposite point on the bank of a stream iswimmingwith a speed of 0.5m/s at an angleof 120° with the direction of flow of waterThe speed of water in the stream is

Answer»

Vᵣ = velocity of river or stream = ?

Vs = velocity of swimmer = 0.5 m/s

V= resultant velocity

given angle is total angle ie 90+30= 120

From figure in triangle Δ

sin θ = p/ h

sin 30⁰ = Vᵣ / Vs

1/2 = Vr/ 0.5

so Vr= 1/4 ie

Vr = 0.25 m/s so velocity of river is 0.25 m/ s

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