What does the speedometer in a moving car measure?

In what direction does the medium move relative to the direction of the wave? explain.

In order to do work, the force vector must be question 1 options: in a different direction than the acceleration vector. in a different direction than the displacement vector. in the same direction as the displacement vector and the motion. in the same direction as the acceleration vector.

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?