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nguyenmanhdung2582007
2 năm trước
giúp mình với trước 7h tối Một con lắc đơn gồm một vật nhỏ treo vào một điểm cố định bằng sợi dây mảnh, nhẹ, không dãn có chiều dài l = 1 m. Kéo cho dây treo làm với đường thẳng đứng một góc 45độ rồi thả nhẹ. Bỏ qua sức cảncủa không khí. Lấy g = 10 m/s2 Tốc độ của vật nhỏ khi qua vị trí dây treo lệch góc 300so với phương thẳng đứng là A. 17,8 m/s. B. 35,2 m/s. C. 1,78 m/s. D. 3,52 m/s.
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