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Grade: 12th pass
        A man move on the ground with velocity 10km/h. The rain is falling vertically on him. To protect himself from the rain, man increased his speed to 20km/h, then rain fall on him by making an angle 30° by verticle. What will be the velocity of rain.
5 months ago

Answers : (1)

Arun
11577 Points
							
That statement implies that the rain has a horizontal component of 10 km/hr in the same direction the runner is running. When he runs at the same speed, the rain apears to come straight down. 

If he increases his speed to 20 km/hr, there is a 10 km/hr relative velocity of wind into his face. The vertical component of the wind velcity, Vy, must such that 10/Vy = tan 30 
Vy = 17.32 km/hr 
Vx = 30 km/hr 
Wind speed (magnitude) = 34.5 km/hr
5 months ago
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