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किसी कण पर आरोपित बल `vecF = ( 3hati + 4hatj - 5hatk)` न्यूटन कण में विस्थापन `vecs = ( 5hati + 4hatj + 3hatk)` मीटर उतपन्न करता है | ज्ञात कीजिए :
(i) बल द्वारा किया गया कार्य
(ii) बल `vecF` व विस्थापन `vecs` के बीच कोण

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(i) 16 जूल, (ii) `cos^(-1) (8)/(25).`

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