一人自原点出发,25s内向东走30m,又10s内向南走10m,再15s内向正西北走18m,这50s内的位移为( )
A: -17.27i-2.73j
B: -17.27i+2.73j
C: 17.27i+2.73j
D: 17.27i-2.73j
A: -17.27i-2.73j
B: -17.27i+2.73j
C: 17.27i+2.73j
D: 17.27i-2.73j
举一反三
- SJ01-7 一人自原点出发,25s内向东走30m,又10s 内向南走10m,再15s内向正西北走18m,则在这50s 内平均速度的大小为()
- 执行下面程序段后,输出的结果为( )。 Dim m(5) As Integer s = 0 For i = 0 To 5 m(i) = 5 Next i For j = 0 To 5 s = s + m(j) Next j Print s
- 3. 第② 空: A: s←a[i,j] B: s←s+a[i,j] C: s←s+a[j,i] D: s←a[j,i]
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