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Motion in a Straight Line — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsMotion in a Straight Line1 Mark
MCQ
Wind is blowing west to east along two parallel tracks. Two trains moving with same speed in opposite directions have the steam track of one double then other. The speed of each train is:
  • A
    Equal to that of wind.
  • B
    Double that of wind.
  • C
    Three times that of wind.
  • D
    Half that of wind.
✓

Answer

  1. Three times that of wind.

Explanation:

Let u and v be the speed of train and wind respectively. The speed of steam track of train moving in the direction of wind = u - v.

The speed of steam track of train moving in the opposite direction of wind = u + v

As per question, (u + v) = 2(u - v)

u = 3v

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