A toy model of an amusement park ride has a central shaft that rotates while carts attached to the top of the shaft by threads fly outward. The force that keeps the carts in a circular path is provided by the tension in the thread when the cars are 0.25 m from the center:

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The answer would be a) -80of

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. 

The answer is -6hope this