Is it true that the minimum speed of a rocket used for launching a satellite is 10.8 kilometres per second?

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True

False

answer is B.

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Detailed Solution

The above statement is False.
If a rocket is launched from the surface of the Earth, it needs to reach a speed of at least 7.9 kilometres per second (4.9 miles per second) in order to reach space. This speed of 7.9 km/s is known as the orbital velocity, and it corresponds to more than 20 times the speed of sound. The minimum speed of a rocket really depends on what you mean by space. If you just want to get into orbit around the Earth, you need to reach a speed of at least 4.9 miles per second or about 17,600 miles per hour.
The correct statement would be if a rocket is launched from the surface of the Earth, it needs to reach a speed of at least 7.9 kilometres per second in order to reach space.

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