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sakura1082001
2 năm trước
Một chất điểm chuyển động trên trục Ox có phương trình chuyển động là: x = 40 -20t (x tính bằng km và t tính bằng h) với gốc thời gian là lúc vật bắt đầu chuyển động thẳng đều. Hãy cho biết chiều chuyển động so với chiều dương của trục tọa độ và tốc độ chuyển động của vật. Tính quãng đường đi được của vật từ lúc t = 2h đến lúc t = 10h .
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