A neon green bowling ball has a mass of 12 kg and a velocity of 6.40 m/s [E39S]. After rolling across the an alley (of negligible friction) it collides with a stationary chair whose mass is 18 kg. After an elastic collision, the chair has a velocity of 2.83 m/s [E45S]. What is the velocity of the neon green bowling ball after the collision?

Ithink it is letter b, i may be wrong but i think that is the answer

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. 

Ibelieve the answer is d. densityhope my answer has you : )