CO2 levels above 5% of atmospheric composition are considered dangerously toxic. Assume that the amount of CO2 in the spacecraft atmosphere prior to the failure of the scrubbing system is negligible. Based on the normal daily rate of CO2 production, how much time after the
failure does the crew have until the CO2 level reaches 5%?

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.