Question: 1. You are standing on a corner and a friend is driving past in an automobile. Both of you note the times when the car

1. You are standing on a corner and a friend is driving past in an automobile. Both of you note the times when the car passes two different intersections and determine from your watch readings the time that elapses between the two events. Which of you has determined the proper time interval?

2. What is the energy of a proton whose momentum is 3m₀c?

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