A 115 kg hockey player, Adam, is
skating east when he tackles a
133 kg player, Bob, skating west at
-1.59 m/s. Afterward, they move
together at 0.250 m/s east. What
was Adam's velocity before the
collision?

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?