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huongnhaile
2 năm trước
Câu 69. Một đầu tàu khối lượng 200 tấn đang chạy với vận tốc 72 km/h trên một đoạn đường thẳng nằm ngang. Tàu hãm phanh đột ngột và bị trượt trên quãng đường dài 160 m trước khi dừng hẳn. Lực hãm tàu (được coi như không đổi) có độ lớn là A. 1,5.105 N. B. 2,5.10-4 N. C. 2,5.105 N. D. 1,5.10-4 N. Câu 70. Một ôtô có khối lượng 4 tấn đang chạy với vận tốc 36 km/h người lái thấy chướng ngại vật cách xe 25 m, hãm phanh ôtô dừng cách vật chướng ngại 5 m. Lực hãm phanh nhận giá trị A. 2.10 4 N. B. 104 N. C. 103 N. D. 8.102 N. Câu 71. Một ô tô có khối lượng 4 tấn đang chạy với vận tốc 36 km/h trên mặt phẳng ngang thì lái xe thấy có chướng ngại vật và hãm phanh với lực hãm là 2,5.104 N. Quãng đường xe đi được từ khi hãm phanh đến khi dừng hẳn là A. 16 m. B. 0,8 m. C. 1,6 m. D. 8 m.
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