Explain how the law of conservation of energy applied to the energy transformations that occur from the outlet charger to the ringing phone

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s

What is the single most important equation in all of physics?