Kinematics Question 321
Question: 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
Options:
A) 10 km/hr
B) 20 km/hr
C) 30 km/hr
D) 40 km/hr
Show Answer
Answer:
Correct Answer: B
Solution:
When the man is at rest w.r.t. the ground, the rain comes to him at an angle 30° with the vertical.
this it’s the direction of the velocity of raindrops with respect to the ground.
Here
and
We have
aking horizontal components equation (i) gives