Relative Velocity

Question 1

What is the notation for velocity of A relative to B

Answer 1

RAB

Question 2

What is the formula of relative velocity of A with respect to B

Answer 2

RAB = Va- VB

And V A and VB are respect to the earth!

Question 3

When doing with impulse momentum diagram, what to take care about signs

Answer 3

Draw the before and after diagrams, and then keep signs consistent (because then answer always right)

So if draw second scenario both arrows same way that’s fine

If not and drew oppsote way remember ti VA - -VB so Va+Vb!