23) A student applies a 12 N force to pull a crate up a 3 m hill. What is the potential energy of the crate at the top of the hill?
(Hint: PE = Work done against gravity).

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)