Why does a steel ball fall with uniform velocity in a liquid although resultant force along vertical direction is zero ?

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.

Does anyone have the answers to online physics course plato course physics, semester a v3.0

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.