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

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