Question

A car is moving with speed 80 km/h and another car is moving with velocity 60 km/h opposite to car A what is relative velocity

Answer 1

Velocity of Car A = 80 km/h with respect to ground

Velocity of Car B = - 60 km/h with respect to ground

Since, the cars are moving in the opposite direction, and if you are sitting in one of the cars, it will appear to you that the other car is coming towards you fast.

Hence, to find the relative velocity of one car with respect to another, we need to add them.

$V_A_B = V_A - V_B$

$V_A_B = 80 - (-60)$

$V_A_B = 80 +60 = 140$ Km/h

Hence, the relative velocity of one car with respect to another is 140 km/h