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tuanminh280898@gmail.com
2 năm trước
Hòn đá có khối lượng m = 1kg ở độ cao 1m được ném thẳng đứng lên với vận tốc v0 = 2m/s. Chọn gốc thế năng tại mặt đất . Thế năng bằng 1/2 động năng khi vật có độ cao ( Gợi ý lập hệ 2 phương trình - Phương trình thứ 2 : Wd + Wt = W . Tính được thế năng tính độ cao )
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