Measured speed vs actual speed very simple

[asfd]

Measured speed vs actual speed **very simple**

If we measure the speed of a moving object with two movement detector positioned as on the atttached drawing, i.e. one is facing the movement and the other makes a slight angle with the movement, does the detector not directly in the movement line "sees" a bigger speed since if we see this as a trinangle the hypotenuse is bigger than any other side. If so how can we calculate the difference(what other info do we need?)?

 

[jdstokes]

If we measure the speed of a moving object with two movement detector positioned as on the atttached drawing, i.e. one is facing the movement and the other makes a slight angle with the movement, does the detector not directly in the movement line "sees" a bigger speed since if we see this as a trinangle the hypotenuse is bigger than any other side. If so how can we calculate the difference(what other info do we need?)?

The out of line detector sees the projection of the velocity vector onto the broken line. The magnitude of the projection is less than or equal to the original vector.