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QJEEM20Ph9798: JEE Main 2020 Physics - Class 11 JEEM20Ph9798 Solution: When a car is at rest, its driver sees rain drops falling on it …

When a car is at rest, its driver sees rain drops falling on it vertically. When driving the car with speed v, he sees that rain drops are coming at an angle 60° from the horizontal. On further increasing the speed of the car to (1 + β)v, this angle changes to 45o. The value of β is close to :

Multiple Choice Options

  • A 0.5
  • B 0.73
  • C 0.37
  • D 0.41

Step-by-Step Verified Solution

JEE Main 2020 (Online) 6th September Evening Slot Physics - Motion in a Plane Question 54 English Explanation

tan 60o = VrV .....(1)

tan 45o = Vr(1+β)V .....(2)

From (i) and (ii), we get

31=1V1(1+β)V

⇒ 3=(1+β)

⇒ β = 0.732

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