Two parallel rail tracks run north south. Train A moves north with a speed of 54 km/h and train B moves south with a speed of 90 km/ h
The relative velocity of B with respect to A is
(a) – 90 km/h
(b) –144 km/h
(c) –132 km/h
(d) none of these
Correct option (b) –144 km/h
Explanation:
Let vA = 54 km/h
then vB = – 90 km/h
∴ Relative velocity of B with respect to A
The velocity of train B with respect to train A appears 144 km/h along south.