How much force is needed to push a 54kg sled that is accelerating 5 m/s^2

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

Acar of mass m goes around a banked curve of radius r with speed v. if the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to 101) a) mv2/r b) mg/2. d) mg e) tan[v2/(eg)]

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?