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Cho một con lắc đơn dài 98m, nặng 5kg đặt tại nơi có gia tốc trọng trường g = 9,8m/s2. Trong quá trình dao động góc lệch cực đại của dây treo con lắc là 0,02rad. Tính vận tốc lớn nhất và lực căng dây lớn nhất. A. 0,62m/s; 48N B. 0,62m/s; 49,01N C. 0,60m/s; 48N D. 0,62m/s; 49,02N
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