Home Physics Vectors Relative Velocity A man standing on a road hold his umbrella a…
Physics Vectors Relative Velocity MCQ (Single Correct)

A man standing on a road hold his umbrella at 30 ° with the vertical to keep the rain away. He throws the umbrella and starts running at 10 km/hr. He finds that raindrops are hitting his head vertically, the speed of raindrops with respect to the road will be

A
10 km/hr
B
20 km/hr
C
30 km/hr
D
40 km/hr

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Text Solution

Verified by Experts
The correct answer is:
B

When the man is at rest w.r.t. the ground, the rain comes to him at an angle 30° with the vertical. This is the direction of the velocity of raindrops with respect to the ground.

Here velocity of rain with respect to the ground

velocity of the man with respect to the ground.

and velocity of the rain with respect to the man,

We have ......(i)

Taking horizontal components equation (i) gives

or

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