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JEE Main202330 Jan 2023Evening ShiftPhysicsMotion in One DimensionActual

A vehicle travels 4 km with speed of 3 km h - 1 and another 4 km with speed of 5 km h - 1 , then its average speed is :

Options

  1. A4 . 25   km   h - 1
  2. B3 . 50   km   h - 1
  3. C4 . 00   km   h - 1
  4. D3 . 75   km   h - 1

Correct answer

D. 3 . 75   km   h - 1

Step-by-step solution

Average speed in this case is given by, 2 v a v = 1 v 1 + 1 v 2 ⇒ 2 v a v = 1 3 + 1 5 ⇒ 2 v a v = 8 15 ⇒ v a v = 15 4 = 3 . 75   km   h - 1

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