Question: Two railway tracks are parallel to west-east direction. Along one track, train A moves a speed of 54km/h from west to east while along the second track train B moves with a speed of 90km/h from east to west. Find (i) relative velocity of ground w.r.t. B.

Posted by: Aman on 07.07.2018

0-(-90)=90

here the right answer is 90kmph because in the reference frame train B and road is present.

The relative velocity of ground w.r.t B is 90 km/hr
Speed of train - 90 km/h, Speed of ground - 0 km/h, Relative velocity of ground = (0-90)km/h east to west. = -90km/h east to west. = 90km/h west to east. Therefore, Relative Velocity of Ground w.r.t Train = 90km/h west to east.

The relative velocity of of train B with respect to ground is 90 km/h or 25 m/s

The Relative Velocity of the ground with respect to Train B is 90 km/hr.

90

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