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nhungthienthanmongmanh
2 năm trước
Giúp mình với ạ Một quả bóng có khối lượng 0,40 kg bay với vận tốc 30 m / s. Khi quả cầu bị đập ngược lại theo hướng bay của gậy, tốc độ của nó là 80 m / s. Trả lời các câu hỏi sau khi chiều chuyển động của quả cầu bay là chiều dương. (1) Tìm động lượng của quả bóng đang bay. (2) Tìm động năng của quả cầu đang bay. (3) Tìm xung lực mà quả bóng nhận được từ gậy.
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