Newton's First Law states that when an object is not in motion, it will stay motionless until a force is acted upon it. In this case, you are not moving, so unless a force acts upon you, you will stay in place.
the best option would be d.) examples of constructive erosion.
if your not able to reverse it that means it is a chemical change and with toast you cant reverse the color if the color has changed that most likely means it is a chemical change.
1) Acceleration of the sled
The acceleration of the sled is given by the net force acting in the direction parallel to the incline. There are two forces acting along this direction: the component of the weight parallel to the ramp (downward) and the friction (upward). Therefore, the net force acting in this direction is

And the acceleration is given by Newton's second law:

2) Normal force
The normal force acting on the sled is equal to the component of the weight perpendicular to the incline, therefore:
