Question

What is the relative velocity of the vehicles moving in same direction?(do we have to add or subtract)

Answer 1

Explanation:

we should subtract it

this is your answer

Answer 2

Answer:

We should subtract.

Relative velocity of two body having velocity u and v respectively is (u-v)

If v is opposite direction of u then relative velocity is {u-(-)v} =(u+v)

If v is in same direction with u then relative velocity is (u-v)