R4T.4 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 passen- gers (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 synchro- nized watches and compare readings later). Assuming th earth\'s frame is inertial, who measures (a) the longest time interval between these events? (b) the shortest time interval between these events? (c) the spacetime interval between the events? A. Jennifer B. Rob C. The train passengers Solution Answers : (a) Passengers : During travel passengers takes more times to calculate time interval they travel with constant velocity and accelaration and after time synchronization of watches time lap go high as compared to Rob and Jennifer (b) Rob : Because reaction time of Rob is earlier than Passengers and Jennifer (c) Jennifer .