Jennifer bungee-jumps from a bridge (event A). Jennifer’s bungee cord is perfectly elastic, so she bounces exactly back up to the bridge and lands on her feet (event B). The time between these events is measured by Jennifer’s watch, a stopwatch held by Jennifer’s friend, Rob, who is standing on the bridge, and by two passengers (one present at event A and one present at event B) who are riding on a train traveling at a constant velocity across the bridge at the time (the passengers have synchronized watches and compare readings later). Assuming the earth’s frame is inertial, who measures
(a) the longest time interval between these events?
A. Jennifer
B. Rob
C. The train passengers
C. The train passengers
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