Anonuniform, 80.0-g, meterstick balances when the support is placed at the 51.0-cm mark. at what location on the meterstick should a 5.00-g tack be placed so that the stick will balance at the 50.0 cm mark?

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?