Q71.दो समान्तर बल P तथा Q (P > Q) क्रमशः बिन्दुओं A और B पर कार्यरत हैं। जब P तथा Q समदिश हैं तो इनका परिणामी बिन्दु C पर कार्यरत है, जब P तथा Q विपरीत दिशा में हैं, तब इनका परिणामी बिन्दु D पर कार्यरत है, तो CD बराबर है —
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