Please solve last four questions

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

Which levels of government establish and implement educational requirements for minors

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2