A roller coaster starts from rest at the top of a 90 m hill. How fast will it be going at the
bottom of the hill, if there is no friction? Use Conservation of Energy GPE = KE to solve

Acup of coffee sits on the dashboard of an automobile. the car goes around a sharp curve. even though you hold the cup still, coffee still splashes out. this can best be explained due to a) density. b) friction. c) gravity. d) inertia.

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

Brutus, the dog, is pulling a bone to the left with a force of 20 n. lassie, another dog, is pulling a bone to the right with a force of 18n. what is the net force? a. b. c.