Answer: Option (E)
Explanation:
There are only two forces acting on the car: The force of gravity, which point down, and the normal force generated by the interaction of the car and the ramp, which points perpendicular to the ramp.
,
:mass of the car ;
:angle of the ramp.
: gravity's acceleration.
is constante since all parameters are constants.
So, since the force of gravity is also constant, the net force acting on the car is constant. Since velocity decreases over time and the car stars moving down, the force is pointing down the ramp.