Plz help me promise will mark you brainiest

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?