Which of the following is an example of a contact force? a magnet repelling another magnet without touching it a ball falling the ground when it is dropped a child pushing a toy car gravity keeping the earth in order around the sun

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.)