Question

To a person running at a speed 8 km/h rain appears to fall vertically. he increases his speed to 12 km/h and finds that the drops make angle 30 degrees with vertical. find the actual speed of rain. ​

Answer 1

Answer:

Explanation:

Shows that the horizontal component of rain =8 km/hr as the relative velocity of the rain has only a vertical component with respect the man.

Va=8km/hr

Vrm=Vr-Vm=(8-Vb)-12=-4-Vb

tan30=4/Vb

Vb=4root 3 km/hr

velocity of rain=(8-4 root 3)km/hr

tan aplha =2/(root 3)

Answer 2

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