How much time has elapsed on the earth

Reference no: EM13647960

A spaceship takes a nonstop journey to a planet and returns in 10hours according to a clock on the spaceship. If the speed of the spaceship is 0.80c, how muchtime has elapsed on the Earth?

A) 3.2 h
B) 7.0 h
C) 15 h
D) 17 h

Reference no: EM13647960

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