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🔥Class 9 Science Chapter 10 Part-1 | गुरुत्वाकर्षण | Bihar Board | Bihar Daroga police BPSC Army SSC
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🔥 NCERT Class 9 Science Chapter 11 | कार्य तथा ऊर्जा (Work and Energy) Part-1 | By Shambhu Sir
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🔥NCERT 9th Science Chapter 11 | कार्य तथा ऊर्जा (Work & Energy) Part-2 | Full Concept | Shambhu Sir
