A body can escape the gravitational pull of the earth if it is thrown up with a velocity of?
Correct answer: C. 7 miles per sec
- A. 25 miles per sec
- B. 60 miles per sec
- C. 7 miles per sec
- D. 10 miles per sec
- E. None of these
Explanation
Earth's escape velocity is about 11.2 km/s, or approximately 7 miles per second, ignoring air resistance. At this speed, an object can escape Earth's gravitational field without further propulsion.
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