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W=Fd (joule=N.in) यदि वस्तु और वस्तु पर बल अपने स्थान से हिलता या विस्थापित होता है तो दोनों कार्य करते हैं। उदा। यदि आप दीवार पर बल लगाते हैं लेकिन दीवार नहीं चलती है W=0 J
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W=Fd (joule=N.m)if force on object & object is move or displace from its place work done. Ex.,if you force on wall but wall not move W=0 J