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9. When a man is standing, rain drops appear to himfalling at 60° from the horizontal from his front sideWhen he is travelling at 5km per hour on a horizon-tal road they appear to him falling at 30°, from thehorizontal from his front side. The actual speed ofthe rain is in km per hour):(2006 E)4) 61) 32) 43) 5 |
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Answer» Given in the question :- Here |v | = 5 km/hr. u = ? θ = 60° φ = 30° We know, by the formula tanφ = usin60° / (v + u cos 60°) tan 30° = ( u × √3/2 ) / ( v + u/2 ) 3/2 u = 5 + u/2 3/2 u - u/2 = 5 u = 5 km/hr The actual speed of the rain is 5 km/hr hit like if you find it useful |
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