Alice and Bob are passengers in a high-speed train moving at a uniform speed of v = c/2. Alice is at the rear of the train car and Bob is at the front of the car. The length of the car measured in their frame is L'. Alice throws a ball to Bob at speed u' = c/3.
a) In the frame of the train, how long does it take the ball to reach Bob?
b) In the frame of the station, how long does it take the ball to reach Bob?
c) In the frame of the ball, how long does it take the ball to reach Bob?
d) Verify that the proper time between Alice throwing the ball and Bob receiving it is the same in all three frames.

What happens to atoms and chemical bonds during a reaction?

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.

Me with this and you will be marked brainliest