Question

A man is holding an umbrella at angle ${30}^o$ with vertical with lower end towards himself, which is an appropriate angle to protect him from rain for his horizontal velocity $10m/s$. Then which of the following will be true?

• A. Rain may be falling at an angle of ${30}^o$ with the vertical towards left side
• B. Rain may be falling at an angle of ${30}^o$ with the vertical, towards right side
• C. Rain may be falling vertically
• D. None of these

Answer 1

Answer: (B), (C)

The correct options are
B Rain may be falling vertically
C Rain may be falling at an angle of ${30}^o$ with the vertical, towards right side

From the given image we can conclude that if the person is fully protected from the rain then rain must be falling at an angle ${30}^0$ with the vertical towards the right side (as umbrella is pointed towards right side).
Another possible by which the person can remain dry is rain may be falling vertically. In this scenario if the person is holding umbrella close enough to his body then he will remain dry.