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Solution


Q.

Train A is moving along two parallel rail tracks towards north with speed 72 km/h, and train B is moving towards south with speed 108 km/h.

Velocity of train B with respect to A and velocity of ground with respect to B are (in ms-1)               [2024]
1 −30 and 50  
2 −50 and −30  
3 −50 and 30  
4 50 and −30  

Ans.

(4)

=72×518=20 m/s    =108×518=30 m/s

Velocity of train B with respect to train A

VBA=VB-VA=30-(-20)=50 m/s

[Taking South = +ve, North = -ve]

Ground is at rest, so

VGB=VG-VB

=0-(30)=-30 m/s