Một người dùng dây kéo một vật có trọng lượng P=50N trên mặt sàn nằm ngang nghiêng 1 góc α=30o so với phương ngang hệ số ma sát trượt giữa vật và mặt sàn là μ=0,3. Hãy xác định độ lớn của lực kéo
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sorry can't read, cuz too small the words.
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