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NTA Abhyas JEE Main2020PhysicsMotion in Two DimensionsPractice

Rain drops fall vertically at a speed of 20 m s - 1 . At what angle (in degree) do they fall on the wind screen of a car moving with a velocity 15 m s - 1 , if the wind screen is inclined at an angle of 23 ° to the vertical? [ tan - 1 0 . 75 ≈ 37 ° ]

Correct answer

60

Step-by-step solution

tan ( 90 ° - θ ) = 20 15 ∴ c o t θ = 20 15 = 4 3 ⇒   θ = 37 ° ∴   ϕ = 37 ° + 23 ° = 60 ° (Angle made with the windscreen)

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