QUESTION 1 10 points Save Answer shown below are six situations where people are

Question

QUESTION 1 10 points Save Answer shown below are six situations where people are walking or running along flat train cars. The people are walking/running at various speeds either in the direction the train is traveling or in the opposite direction to the train's direction. The speed of the train and the speed and direction ofeach person relative to the train are given in each figure. An observer is standing beside the track watching the train go by. Rank these walkers/runners, from fastest to slowest, on basis of how fast are moving speed relative to an observer standing beside the tracks That is, put the the the and put the person the would say was the slowest person observer would say the fastest For situations where the observer would say the speed is the same, rank in alphabetical order For example, if F B A E c >D enter the order as FABCE D or if they are all the same then enter the order as ABCDEF 30 20 mis

Explanation / Answer

velocity of train w.r.t. observer=Vto

velocity of person w.r.t. train=Vpt

then velocity of person w.r.t. observer=Vpo=Vpt+Vto

direction to the right is considered positive and to the left is considered negative.

case A:

Vto=24 m/s

Vpt=-8 m/s

then Vpo=24-8=16 m/s

case B: Vp0=-20 m/s

case C:
Vpo=20-4=16 m/s

Case D:

Vpo=20+12=32 m/s

case E: Vpo=-16-4=-20 m/s

case F:16+8=24 m/s
so the correct ranking will be:

D > F > B = E > A =C

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