Relative motion

Question 1

How do you calculate the relative motion of two trains moving towards each other at the opposite direction? (One red train another blue)

Answer 1

You add the speeds together
E.G - 30 km/h + 25 km/h = 55 km/h

Question 2

If you are sat on the red train why does the blue train appear to move faster and closer compared to when you sat at the side of the track?

Answer 2

Because the Blue train is moving towards you whilst you’re also moving towards

Question 3

How do you calculate the relative motion for when you have two objects moving at the same direction and the same straight line?

Answer 3

You subtract their speed to calculate relative motion
E.G - 30 mph - 20 mph = 10 mph