NEET Physics Gravitational Potential Energy MCQ Question
Calculate the gravitational potential energy of a 2 kg object at a height of 400 km above the Earth's surface. Assume the Earth's mass as 6.0 × 10^24 kg, the Earth's radius as 6.4 × 10^6 m, and G as 6.67 × 10^-11 N m^2 kg^-2.
-1.2 × 10^7 J
-2.5 × 10^7 J
-4.5 × 10^7 J
-3.1 × 10^7 J
Correct Answer
Detailed Explanation
Using the formula for gravitational potential energy W(r) = - G M m / r, at r = Earth's radius + 400 km, the potential energy is calculated as approximately -3.1 × 10^7 J.
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