A.10s末,120kg•m/s | B.20s末,60kg•m/s |
C.10s末,60kg•m/s | D.20s末,240kg•m/s |
12-6 |
2 |
0-6 |
2 |
A.可能为零 | B.不可能为10N•s |
C.可能为16N•s | D.可能为20N•s |
A.一定是OA方向 | B.一定是OB方向 |
C.可能是OC方向 | D.可能是OD方向 |
A.1m/s | B.1.5m/s | C.2m/s | D.2.5m/s |
A.t1:t2:t3 |
B.3t1:2t2:t3 |
C.t1:(t1+2t2):(t1+2t2+3t3) |
D.2t1:(3t2+2t1):(6t3+3t2+2t1) |
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