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Q.

Which of the following options is correct for a  spaceship travels 36000 km in one hour. Express its speed in km/s?


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a

10 km/s

b

20 km/s

c

30 km/s

d

40 km/s 

answer is A.

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Detailed Solution

The speed of the spaceship is 10 km/s.
We know that speed is the rate of change of distance with respect to time.
So, speed= distance time
Given, distance = 36000 km.
Time = 60 min.
⇒ = 60 × 60 s
⇒ = 3600 s
speed= 36000 3600.
⇒ = 10 km/s
Thus, the speed is 10 km/s.
 
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