Two hockey pucks with mass 0.1 kg slide across the ice and collide. before the collision, puck 1 is going 13 m/s to the east and puck 2 is going 18 m/s to the west. after the collision, puck 1 is going 18 m/s to the west. what is the velocity of puck 2?

Asubject in a clinical research trial experiences a serious, unanticipated adverse drug experience. how should the investigator proceed, with respect to the irb, after the discovery of the adverse event occurrence? a. do not report the adverse drug experience to the irb since it is a common adverse experience. b. report the adverse drug experience to the irb only if there are several other occurrences. c. report the adverse drug experience as part of the continuing review report. d. report the adverse drug experience in a timely manner, in keeping with the irb's policies and procedures, using the forms or the mechanism provided by the irb.