If you stay on earth while a friend races off in a rocket at a speed close to the speed of light, then according to special relativity you will see a clock on the rocket appear to click more slowly than the one on your wall. If your friend looks back at your clock , then according to the same theory the friend will see your clock appear to tick.
A-At the same speed of the clock on the rocket
B-faster then the clock on the rocket
C-Faster or slower than the clock on the rocket, depending on the direction of travel of the rocket compared with earth
D-slower than the clock on the rocket.
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