Question

Two railway tracks are parallel to west-east direction. Along one track, train A moves with a speed of 30
m/s from west to east, while along the second track, train B moves with a speed of 48 m/s from east to
west. Calculate (i) relative speed of B wrt A and (ii) relative speed of ground wrt B.

Answer 1

Answer:

78 m/s east to west

48 m/s from west to east

Explanation:

two railway track are parallel to west east direction

train A moves with a speed of 30 m/s from west to east

train B moves with a speed of 48 m/s from east to west

Relative speed of B wrt A = B - A

30 m/s from west to east = - 30 m from east to west

= 48 - (-30) = 78 m/s east to west

Ground is stationary

so ground speed = 0 m/s

Relative speed of ground with respect to B = 0 - B

= - 48 m/s from east to west

= 48 m/s from west to east

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