Calculate ms for the object and enter into Table 1. Use your FBDs from steps 5 & 6 and
Newton’s 2nd Law to create your ‘equation’ for ms. Show your work for one calculation here.

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?