5. A developmental psychologist believes that if children successfully lie to their friends, they will be more likely to try lying to their parents. To test this hypothesis, he asks
50 children to report how many times in the last month they have lied to their
friends, and whether they were successful. He then asks them how many times they
have lied to their parents.
Independent variable:
Dependent variable:
Type of study:

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The answer is trial 3.

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero.