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A body needs an escape speed of 11 km/s when launched straight up from Earth’s surface. If the same body is fired at an angle of 45° to the vertical, what will its escape speed be?

1. 112 km/s
2. 22 km/s
3. 11 km/s
4. 11/2 km/s

Correct answer: 11 km/s

Solution

The escape speed is a characteristic of the gravitational field of a planet and does not depend on the angle of launch. Therefore, regardless of whether the body is launched straight up or at an angle, the required escape speed remains the same at 11 km/s.

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