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hieu08122002
2 năm trước
Một viên bi khối lượng m=1kg chuyển động ngang với vận tốc 2m/s rồi đi lên mặt phẳng nghiêng góc nghiêng 30°. Khi vật chuyển động được quãng đường là 0,2m lên mặt phẳng nghiêng thì vật có vận tốc bao nhiêu. Bỏ qua ma sát
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