In the attached file file.
The Attempt at a Solution
In both cases Earth’s gravitational force always acts. For the sled, there is a force opposing the motion which can both be the frictional force between the sled and the hill and air resistance. Answer is E for the left side question. For the ball, there is air resistance. But I am not sure about the terms uses ,”frictional for of the air” “retarding force due to the mass of the ball”. Also, I don’t know if the ball’s mass intrigues its motion.