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QJEEM23Ph7d69: JEE Main 2023 Physics - Class 11 JEEM23Ph7d69 Solution: The speed of a swimmer is 4   km   h − 1 in still…

The speed of a swimmer is 4 km h−1 in still water. If the swimmer makes his strokes normal to the flow of river of width 1 km, he reaches a point 750 m down the stream on the opposite bank.

The speed of the river water is ___________ km h−1

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JEE Main 2023 (Online) 31st January Morning Shift Physics - Motion in a Plane Question 24 English Explanation

Time to cross the River width ω=1000 m\omega=1000 \mathrm{~m} is =1 km4 km/h=\frac{1 \mathrm{~km}}{4 \mathrm{~km} / \mathrm{h}}

Drift x=Vm/g×t\mathrm{x}=\mathrm{Vm} / \mathrm{g} \times \mathrm{t}

Where Vm/g\mathrm{Vm} / \mathrm{g} is velocity of River w.r. to ground.

x=Vm/g×14=750 m=34 kmVm/g=3 km/hr

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