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JEE Main20246 Apr 2024Morning ShiftPhysicsMotion in One DimensionActual

A train starting from rest first accelerates uniformly up to a speed of 80 ~km / h for time t , then it moves with a constant speed for time 3 t . The average speed of the train for this duration of journey will be (in km / h ) :

Options

  1. A40
  2. B80
  3. C30
  4. D70

Correct answer

D. 70

Step-by-step solution

aligned Average speed & = total distance time taken & = 80 t 2 +80 3 t 4 t =70 ~km / hr . aligned

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