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Question


  1. Train

  2. Man X

  3. Car B

  4. Man Y


Solution

The correct option is D

Man Y


Lets check all options Car A in moving 100 km/hr w.r.t train
 = - 100         so the car can't be at rest w.r.t. train.
 = - 100 =VAVt
                        =VA100   
As velocity of train = + 100 km/hr
⇒  - 100 = VA100
                VA=0
So velocity of A w.r.t ground = 0
Option B Man X is in train so his velocity as same as that of the train VX=100m/s.
 = 0 - 100 = - 100 = - 100 and not 0
Option C Car B
Velocity of Car B = - 100 km/hr
 = VAVB =                0 - 100 = + 100
So A is not at rest when seen from B
Option D  Man Y
                Vy=0 w.r.t. ground as he is just standing
                So car A is at rest as seen from Man Y     

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