Q. In which of the following is mechanical energy not conserved?
निम्नलिखित में से किसमें यांत्रिक ऊर्जा संरक्षित नहीं होती है?
Explanation
Friction (a non-conservative force) acts during motion on a rough surface, causing mechanical energy to be converted into heat and sound, thus mechanical energy is not conserved. In free fall, ideal pendulum, and planetary motion (assuming no air resistance and friction), mechanical energy is conserved.
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