Problem: Ted travels in a spaceship at 0.45 c relative to Alice, who's at rest on the Earth's surface. Ted travels for 20s, as measured on his watch. (a) Who measures the proper time, Ted or Alice?(b) How much time elapses on Alice's watch during this motion?

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Ted travels in a spaceship at 0.45 c relative to Alice, who's at rest on the Earth's surface. Ted travels for 20s, as measured on his watch. 

(a) Who measures the proper time, Ted or Alice?

(b) How much time elapses on Alice's watch during this motion?

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Our tutors have indicated that to solve this problem you will need to apply the Consequences of Relativity concept. You can view video lessons to learn Consequences of Relativity Or if you need more Consequences of Relativity practice, you can also practice Consequences of Relativity practice problems .