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ymo06022001
2 năm trước
Câu 9: Dùng một mặt phẳng nghieng để đưa vật có trọng lượng P của vật ( bỏ qua ma sát) Câu 10: ĐỂ ĐƯa một vật nặng 120kg lên cao 2 m người ta dùng mặt phẳng nghiêng dài 6m A)tính lực kéo vật trên mặt phẳng nghieng ,bỏ qua ma sat b) thực tế có ma sát và lực kéo vật là 500N.Tính hiệu suất mặt phẳng nghieng *mong mọi người giúp dỡ
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