Người ta bắn viên đạn có khối lượng m = 100g vào bì cát có khối lượng M
= 20 kg treo ở đầu một sợi dây không dãn khối lượng không đáng kể. Viên đạn sau
khi gặp bì cát bị mắc tại đó và cùng được nâng lên độ cao h= 20cm. Tìm vận tốc
của viên đạn trước khi xuyên vào bì cát. Lấy g = 10m/s2
.
Answers: 2
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Người ta bắn viên đạn có khối lượng m = 100g vào bì cát có khối lượng M
= 20 kg treo ở đầu một sợi...
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