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NTA Abhyas JEE Main2020PhysicsMotion in Two DimensionsPractice

A car A is moving with speed 40 km h - 1 along a straight line 30 ° north of east and another car B is moving with same speed along a straight line 30 ° south of east. The relative velocity of car A as observed from the car B is

Options

  1. A40 km h - 1 north-east
  2. B40 km h - 1 south
  3. C40 km h - 1 north
  4. D40 km h - 1 south-east

Correct answer

C. 40 km h - 1 north

Step-by-step solution

V → A = 40 cos ⁡ 30 o   i ^ + 20 j ^ V → B = 40 cos ⁡ 30 o   i ^ - 20 j ^ ∴ V → A B = V → A - V → B = 40 j ^ The relative velocity of car A as observed from car B is 40   km   h - 1 north

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