Một vật m = 1kg được ném lên thẳng đứng từ độ cao h = 10m với v0 = 20m/s. Lấy g = 10m/s2. a. Tính động năng, thế năng và cơ năng của vật lúc ném? b. Tính động năng của vật khi vật ở độ cao h = 20m? c. Tính thế năng của vật khi vật có vận tốc là v = 10m/s? d. Định độ cao cực đại mà vật lên tới bằng cách sử dụng định luật bảo toàn cơ năng? e. Định tốc độ của vật khi vật chạm đất?

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