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Question

A standing man, observes rain falling with velocity of 20m/s at an angle of 30 with the vertical. Now if he further increases his speed, rain again appears to fall at 30 with the vertical. Find his new velocity.

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

The correct option is B 20m/s
vR=10^i103^j

v"m=vx^i

vRM=(10vx)^i103^j

Angle with the vertical = 30

tan30=10v+x103vx=20m/s

462531_301857_ans_e476f791ab9749d19e8d4aacb3034775.png

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