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Q.

A spaceship travels 36000 km in one hour, express its speed in km/s.


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a

11 km/s 

b

10 km/s 

c

15 km /s 

d

20 km/s  

answer is B.

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Detailed Solution

The spaceship’s speed in km/s is 10 km/s.
“Speed is defined as the ratio of distance covered by a body to the time taken by the body to cover that distance.” The basic unit of speed used in vehicles is km/h. When the speed of a body is very slow, the distance covered by the object is much less, and the time taken is more, and therefore it is expressed in the smaller unit, which is cm/sec, mm/sec or m/min.
We know
Speed=DistanceTime
            =360001hr                 =36000(60×60) km/s   (as 1 hr= 60×60 secs)
            = 10 km/s 
 
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