How does a person looking in a rear view mirror of a car, estimate the distance and approach speed of an approaching cyclist?

Question

anonymous · Answer

Someone plzz help me out with this question

anonymous · Answer

Looking at objects along the road he could estimate the approximate distance between the objects and then make an estimation of how long it takes the cyclist to move from the first object to the second. the speed would then be given by 

velocity = distance traveled/time taken

Don't know about the second one...

anonymous · Answer

But my suggestion doesn't seem very practical so just be aware of that

anonymous · Answer

Most car mirrors are curved outwards and so will tend to bring far objects near the driver.The driver should 'take' the incoming object further behind.