ELi5 : Do overtaking vehicles appear to be travelling faster or slower than if I was stationary?

Question

If I’m in a car travelling at 60mph and am over-taken by a car travelling at 75 mph, do they appear to travel at the same relative speed as when I am stationary and and a car passes me at 15 mph?

Or is this different because we are both moving?

Thanks for any answers.

In: 0

Answer 1

Motion is always relative. So a car moving at 75mph (relative to a stationary object) is moving 15mph relative to you (at 60mph).