A man walks 8km north and then 5km in t thr direction of 60°east of north find the distance from its starting point

Could someone me find the answer to this problem.

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?

What’s #16 asking me and how do i solve it?