A.4m | B.6.25m |
C.36m | D.以上答案都不对 |
v | 20 |
0-
| ||
2a |
0-52 |
2×(-2) |
A.t1=1s | B.t1=2s | C.t1=4s | D.t1=8s |
A.加速度是0.5m/s2 |
B.第3S末的速度是2.5m/s |
C.在前3秒内的位移是4.5m |
D.ns内的位移n2m |
A.2 s | B.
| C.1 s | D.(2-
|
A.300 m | B.288m | C.150 m | D.144 m |
A.20 m/s | B.7.5 m/s | C.10 m/s | D.5 m/s |
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