Your friend is very skeptical of this whole relativity thing, and points out that they have never experienced crazy things like time slowing down, and frankly galilean relativity seems to work just fine. what could you say to your friend to explain why they haven't observed the effects of special relativity?

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.)