Question

A man standing on a road has to 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 rain drop are hitting his

head vertically. Find the speed (in kph) of

raindrops with respect to road.​

Answer 1

Question:-

⇒ A man standing on a road has to 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 rain drop are hitting his  head vertically. Find the speed (in kph) of  raindrops with respect to road.​

Answer:-  

⇒ $\theta = 30$

⇒ $u = 10 km\hr$

⇒ $V_rg = OB$

⇒ $V_pg = OA = 10km/hr$

⇒ $V_rp = OC$

therefore:-

In triangle OBC

⇒ $OB = \frac{CB}{sin30}$

⇒ $OB = 20 kmh^{-1}$

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_

Thank you.....