3.Find the potential energy stored in a ball of mass 5 kg placed at a height of 3 m above the ground. (a) upon the system by a non-conservative force (b) by the system against a conservative force (c) ...
CBSE Class 9 Science Extra Questions and Answers for Chapter 11 - Work and Energy are available here for free PDF download. All these questions are based on the NCERT Class 9 Science Book. Students ...
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