Question

Two cars A and B are moving along in a straight line .Car A is moving at a speed of 80kmph while Car B is moving at a speed of 50 kmph in the same direction find the magnitude and direction of the relative velocity of Car A with respect of Car B

Answer 1

Relative velocity vab= va-vb
Vab= 80kmph-50kmph
Vab= 30kmph
Value is positve so the relative velocity of car in the directn of velocity of car a

Answer 2

Two cars A and B are moving along in a straight line.Car A is moving at a speed of 80kmph while car B is moving at a speed 50kmph in the same direction, find the magnitude and direction of

the relative velocity of car A with respect to B






According to question we have to find the relative velocity of A with respect to B  and relative velocity of B with respect to A
taking the formula when both bodies are moving along same direction we have 
VAB =  VA -  VB  =  80 - 50  =30 km/hr
hence the velocity of carA with respect to carB is 30 km/hr in same direction.
now ​relative velocity of B with respect to A   is  
VBA =  VB -  VA  =  50- 80   =  -30 km/hr
 ​hence the velocity of carB with respect to carA is 30 km/hr in opposite direction .