wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A man standing on a road has to hold his umbrella at 60 with the horizontal to keep the rain away. He throws the umbrella and starts running at 20 kmh1 . He finds that raindrops are hitting his head vertically. The actual speed of raindrops is

A
20 kmh1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
30 kmh1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
40 kmh1
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
15 kmh1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 40 kmh1
When the man is at rest with respect to 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, vrg= velocity of the rain w.r.t. the ground and vmg is the velocity of man w.r.t. the ground.



From figure,
sin30=vmgvrg
or vrg=vmgsin30
=201/2=40 kmh1

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Relative Motion in 2D
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon