# Vectors delta velocity calculations

1. ### NMann

1
Hello,

Two waves originated from point A and point B, waves are 'velocity-direction-dependent', can be treated as 'vectors', it took t2 time for the wave from point B to reach A, and it took time t2 for the wave from point B to reach A.

Given the fact the two vectors have the same 'magnitude', and only the t1 and t2 are known is there a way to calculate delta velocity?

A>>>>>>>>>>> B, in t1 time
B>>>>>>>>>>> A, in t2 time

Distance between A and B is constant, and only known variables are t1 and t2, is there a way to calculate Δv?

thank you!

2. ### Stephen Tashi

4,337
Is it a known constant value? - or it is an unknown value, just known to be some constant?

3. ### HallsofIvy

40,382
Staff Emeritus
If the distance from B to A is d, then the first wave, taking t1 to go from B to A, has speed d/t1. The second wave, taking t2 to go from B to A, has speed d/t2. The "$\Delta v$" is d/t1- d/t2= d(t2- t1)/t1t2.
If you do not know the distance from B to A, then you cannot calculate $\Delta v$.