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JEE Main 2021 (18 Mar, Shift 1) · Relative Velocity in Two Dimensions

Relative Velocity in Two Dimensions question from JEE Main 2021 (18 Mar, Shift 1)

Q14JEE Main 2021 · 18 MAR · SHIFT 1Medium

Relative Velocity in Two Dimensions

A person is swimming with a speed of 10 m/s at an angle of 120 $^\circ$ with the flow and reaches to a point directly opposite on the other side of the river. The speed of the flow is 'x' m/s. The value of 'x' to the nearest integer is __________.

Numerical answer type. Work it out, then open the answer.

Show answer and solution

Answer: 5

To reach directly opposite, the component along the flow must cancel: $x = 10|\cos 120^\circ|$
$x = 10 \times 0.5 = 5$
Answer: $5$

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