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Cuong10sx
2 năm trước
bạn ndduc2001 giúp mình với nhé Một viên đạn 5g bay với vận tốc v xuyên vào bao cát thử đạn khối lượng 3kg (hình 5.20), treo bởi sợi dây dài 0,5m thì nó bị mắc lại trong bao cát và chuyển động lên đến độ cao h làm cho sợi dây hợp với phương thẳng đứng một góc θ=20độ. Bỏ qua sức cản của không khí. Xác định vận tốc của viên đạn ?
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