A spaceship takes a nonstop journey to a planet and returns in 10 hours according to a clock on the spaceship. If the speed of the spaceship is 0.80c, how much time has elapsed on the Earth?
A)3.2 h
B)7.0 h
C)15 h
D)17 h
E)19 h

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The Answer of A spaceship takes a nonstop journey to a planet and returns in 10 hours according to a clock on the spaceship. If the speed of the spaceship is 0.80c, how much time has elapsed on the Earth?
A)3.2 h
B)7.0 h
C)15 h
D)17 h
E)19 h

A Spaceship Takes a Nonstop Journey to a Planet and Returns