Atoy car has a battery-powered fan attached to it such that the fan creates a constant force that is exerted on the car so that it is propelled in the opposite direction in which the fan blows air. the car has a carriage that allows a student to attach objects of different masses, as shown above. the fan has only one speed setting. all frictional forces are considered to be negligible. which of the following procedures could be used to determine how the mass of the fan-car-object system affects the acceleration of the system?