Bài 2: Một vật nặng 5kg được thả rơi tự do từ độ cao 500m, g = 10m/s 2 Chọn mốc thế năng tại mặt đất: a. Tìm vận tốc cực đại của vật b. Tìm quãng đường từ lúc thả vật rơi đến khi đạt vận tốc 20m/s c. Tìm độ cao khi vật đạt vận tốc 50m/s d. Tìm độ cao khi động năng bằng thế năng. e. Tìm vận tốc khi động năng bằng thế năng.

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