33.3 MS
5. A car has a crumple zone that is 0.80 m (80 cm) long In this car, the distance from the dummy to the steering wheel is 0.50 m. The car has a mass of 1,600 kg and
the dummy has a mass of 75 kg. At the time of the crash, the car has a speed of 18 m/s. Based on the work-energy theorem, what is the smallest possible force that
the dummy could experience during the crash?

The independent variable would be the fertilizer as it is what the dependent variable (the growth of grass) depends on.

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. 

Amagnetic field "does not" interact with stationary electric charges. so, a.hope my answer you : )