An aerated lagoon (a sewage treatment pond that is mixed with air) is being proposed for a small lake community in northern Wisconsin. The lagoon must be designed for the summer population but will operate year-round. The winter population is about half of the summer population. Based on these design assumptions, the volume of the proposed lagoon is 3420 m3. The daily volume of sewage in the winter is estimated to be 300 m3. In January, the temperature of the lagoon drops to 0 C, but it is not yet frozen.

If the temperature of the waste water following into the lagoon is 15 C, estimate the temperature of the lagoon in the end of the day.

The answer is a i think

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. 

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