Question

The Kinetic energy needed to project a body of mass m from the earth's surface ( radius R ) to infinity is [AIEEE 2002] ​

Answer 1

Answer:

If any object through with escaping velocity then the object will never come back at the ground, So we can assume it will reach at infinite distance.

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Answer 2

Explanation:- The minimum kinetic energy required to project va body of mass m from earth's surface to infinity vis known as escape energy . therefore

• KE = GMₑ m /R

[∵ g = GMₑ /R²]

• ∴ KE = gR²Mₑ m R /MₑR

⟹ KE = mgr Answer .