During an experiment, a signal from a spaceship reached the ground station in
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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 × 108 m s-1.

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Solution —

Speed of signal = 3 × 108 m s-1

Time taken by the signal to reach the ground station = 5 min = 5 × 60 s = 300 s

So, Distance of the spaceship from the ground station = Speed × Time = 3 × 108 m s-1 × 300 s

= 9 × 1010 m

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