শক্তিৰ সংৰক্ষণশীলতা: বিভিন্ন সংশোধনসমূহৰ মাজৰ পাৰ্থক্য
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1 নং শাৰী:
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[[File:physicsworks.ogg|250px|thumb|
{{cite video
| people =
| title = Work, Kinetic Energy, and Universal Gravitation. MIT Course 8.01: Classical Mechanics, Lecture 11.
| url = http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/video-lectures/lecture-11/
|