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Kepler’s laws apply to any central force following an inverse-square law (e.g., gravitation), making option 4 correct as they describe planetary motion around the Sun. They require circular orbits 1 2 3 4 Correct ans: Option (4) They apply only to Earth They depend on planet mass They apply to inverse-square forces 4
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
The gravitational force provides the centripetal force (GMEmr2 = mv2r), making option 2 correct. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Gravity provides the centripetal force. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: Halliday & Resnick, Fundamentals of Physics, 11th ed., Chapter 13: Gravitation.
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