A toy car rolls at a constant speed down a straight inclined track. When the car reaches the flat surface at the base of the inclined track, the speed of the car decreases.
Which statement best explains why the speed of the car decreases when it reaches the flat
surface?
o
A. The force of gravity acting on the car increases.
B. The force of gravity on the car decreases.
C. The forces influencing the car are not balanced.
D. The forces influencing the car are balanced.

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?