Question

how is constant velocity indicated on a motion map?
by vectors that slowly increase in length
by vectors that are all the same length
by dots that slowly increase in size
by dots that are all the same length

Explanation:

In a motion map, velocity is represented by vectors. Constant velocity means the speed and direction do not change. So, the vectors representing it have the same length (indicating constant speed) and direction. Dots are used to represent position at different times and have nothing to do with indicating velocity.

Answer:

by vectors that are all the same length