Question

Two parallel rail tracks run north -south. train A moves north with speed 54km/h and train B moves south with speed 90km/h. what is the velocity of B with respect to A

Answer 1

Answer:

- 10 m/s

Explanation:

A's speed = 54 km/h

= 15 m/s

B's speed = 90 km/h

= 25 m/s

With respect to A, B's speed is 25 - 15

= 10 m/s

But velocity is a vector quantity which incomplete without a direction.

Hence, velocity of B with respect to A

= - 10 m/s

The minus sign because B is moving in an opposite direction with respect to A