Question

A car is moving with 20m/s velocity, another car is moving with a velocity of 50 m/s. What is the relative velocity of first car with respect to the second?

(a) 30 m/s

(b) -30 m/s

(c) 20 m/s

(d) 25 m/s

This question was posed to me in an online quiz.

My question comes from Motion in a Straight Line in division Motion in a Straight Line of Physics – Class 11

Answer 1

The correct option is (b) -30 m/s

The best I can explain: The formula for relative velocity is VR = Vector VA – Vector VB. Assuming the cars move in the same direction, the relative velocity = 20-50 = -30 m/s. The relative velocity of the second with respect to the first car is 30 m/s.