Toạ độ của chất điểm sau 2h chuyển động là :
x = 4t + 10 = 4.2+10 = 18 (km)
Đ/s: 18km
Đáp án:
A
Giải thích các bước giải:
Tọa độ của chất điểm sau 2h chuyển động:
x=4.2+10=18km
chứng minh rằng: (a-b)-(b+c)+(c-a)-(a-b-c)=-(a+b-c)
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