5. During an experiment, a signal
from a spaceship reached the
ground station in five minutes.
What was the distance of the
spaceship from the ground
station? The signal travels at the
speed of light, that is, 3 x 10^8
m s-1
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The speed of the signal was 3×10^8 metre per second
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the speed of the signal was 3 × 10^8 metre per second
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