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Question: Answered & Verified by Expert
A planet is orbiting the sun in an elliptical orbit. Let $\mathrm{U}$ denote the potential energy and $\mathrm{K}$ denote the kinetic energy of the planet at an arbitrary point on the orbit. Choose the correct statement.
PhysicsGravitationKVPYKVPY 2015 (SA)
Options:
  • A $K < |U|$ always
  • B $K>|U|$ always
  • C $K=|U|$ always
  • D $K=U \mid$ for two positions of the planet in the orbit.
Solution:
2489 Upvotes Verified Answer
The correct answer is: $K < |U|$ always
Total energy must be less than zero and as potential energy is negative so answer is $\mathbf{A}$

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