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tramhoang0806
2 năm trước
1 xe máy nặng 50 kg chuyển động đều trên mặt phẳng nằm ngang biết lực kéo bằng 2 lần trọng lượng của vật ,lực cản bằng 0,5 lần trọng lượng của vật.vẽ hình và biểu diễn tất các các lự tác dụng lên vật .tỉ xích ứng với 200N
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