Question

Two railway tracks are parallel to west–east direction. A long one track, train A moves with a speed
of 30m/s. form 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 velocity of B w.r.t A and (ii) relative speed of ground w.r.t B.

Answer 1

Answer:

i)78m/s

ii)-48m/s

Explanation:

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Relative velocity equation

• if they are moving in same direction,

then, relative velocity, Vab=Va-Vb

• if they are moving in opposite direction,

then, relative velocity,Vab=Va+Vb

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given,

• velocity of train A=30m/s
• velocity of train B=48m/s
• velocity of ground=0m/s

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here,the trians are moving in opposite direction,so,

• relative velocity of train B w.r.t A

=Va+Vb

=30+48

=78m/s

• relative velocity of ground w.r.t B

=0-48

=-48m/s

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hope it helps you...!!!thank you...!!