Question

Two railway tracks are parallel to west-east direction. Along one track, train
A moves with a speed of 54 kmph from west to east while along the second
track train B moves with a speed of 90 kmph from east to west. The () rela-
tive velocity of Bw.rt A and ii) relative velocity of ground w.rt. Bare​

Answer 1

Answer:

1)Velocity of B wrt A=144km/hr

2)Velocity of ground wrt B=90km/hr

Explanation:

It's a question of relative motion.

One train is moving with 54km/hr from west to east and another train with 90km/hr from east to west..... That is,These trains are moving in opposite directions towards each other.

Let,Direction from West to East be Positive and East to West be Negative.

So,Velocity of train A=54km/hr

Velocity of train A=54km/hr Velocity of Train B=(-90)km/hr

Relative Velocity of B w.r.t A=(Velocity of B )- (Velocity of A)

=(-90)-(54)

= -(90+54)

=144km/hr

Ground is at rest,That is,Its velocity=0

Relative velocity of ground w.r.t. B=(Velocity of Ground)-(Velocity of B)

=0-(-90)

=90km/hr