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7. MOTION
easy
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, $3 \times 10^{8}\,m\,s^{-1}$.
A
$19 \times 10^{10} \,m$
B
$29 \times 10^{10} \,m$
C
$39 \times 10^{10} \,m$
D
$9 \times 10^{10} \,m$
Solution
Speed $=$ $3 \times 10^{8} \,m \,s ^{-1}$
Time $=5 \,min =5 \times 60=300 \,secs$ .
Distance $=$ Speed $\times $ Time
Distance $=3 \times 10^{8} \,m s ^{-1} \times 300 \,sec =9 \times 10^{10} \,m$
Standard 9
Science
