A rocket needs the speed of _______ to escape from earth's gravity?
Correct answer: D. 7 miles per second
- A. 22 miles per second
- B. 15 miles per second
- C. 12 miles per second
- D. 7 miles per second
Explanation
Earth's escape velocity is about 11.2 km/s, or approximately 7 miles per second. A rocket must reach this ideal speed, ignoring atmospheric drag and other losses, to escape Earth's gravity.
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