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Question

Raindrops are falling vertically with a velocity 10m/s. To a cyclist moving on a straight road the raindrops appear to be coming with a velocity of 20m/s. The velocity of cyclist is

A
10m/s
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B
103 m/s
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C
20m/s
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D
203m/s
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Solution

The correct option is A 103 m/s
Let the velocity of the cyclist be vx
Velocity of the rain is vy=10m/s
Relative velocity =vx along x and vy along y
Hence relative velocity =v2x+v2y=20ms1
v2x+100=400
v2x=400100=300
Therefore, the velocity of cyclist, vx=103ms1
Hence option B is correct.

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