The escape velocity of a body in gravitational field of earth is independent of__________________?
Correct answer: C. both its mass and the angle at which it is thrown
- A. its mass
- B. the angle at which it is thrown
- C. both its mass and the angle at which it is thrown
- D. gravitational field of earth
Explanation
Escape velocity is v = √(2GM/R), so it depends on the planet's mass and radius, not on the mass of the escaping body. The required launch speed is also independent of launch direction in the ideal gravitational model, although the angle can affect the path. The likely wrong choice is a because students may remember only that the escaping body's mass cancels from the energy equation.
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About Potential Energy
Potential energy is energy stored because of position or configuration, including gravitational potential energy near Earth's surface and elastic energy in a stretched or compressed spring. Questions use changes in potential energy and conservation of mechanical energy, while distinguishing a chosen reference level from an absolute zero of energy.
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