I have a question Thank you

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. 

Ansa new gas is observed in the form of bubbles;

The answer is b. all other properties are crucial.

W= δenergymg = 20.0 nenergy is potential energy.w = δek = mgh = (20.0 n) * 1.50 m = 30.0j30.0 j is done on the object.