NCERT Solutions for Class 9 Science Chapter 8
Motion
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-102
Questions No-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 10⁸ m/s.
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Here we have, speed = 3×10⁸ m/s
Time = 5 minute = 5 × 60 s = 300 s
Using, Distance = Speed × Time
⇒ Distance = 3 ×10⁸ × 300 m = 900 × 10⁸ m = 9.0 × 10¹⁰ m
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