STANDARD Physics Escape Velocity MCQ Question
The escape speed of any projectile on Earth's surface is 11.2 km/s. A body is projected with thrice this speed. What is the speed of the body far away from the earth? Ignore the presence of the sun & other planets.
31 km/s
33.6 km/s
27.8 km/s
22.8 km/s
Correct Answer
Detailed Explanation
The velocity of the body far away from the earth is v∞. The sum of kinetic and potential energy will be constant for the body. Applying KE + PR = Constant, we find v∞ = √8vₑ = 31 km/s.
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