A.物体沿DA滑到底端时具有最大速率 |
B.物体沿EA滑到底端所需时间最短 |
C.物体沿CA下滑,加速度最大 |
D.物体沿DA滑到底端所需时间最短 |
1 |
2 |
d |
cosθ |
d |
cosθ |
1 |
2 |
|
|
A.经过P杆时的速率是5m/s |
B.车的加速度是1.5m/s2 |
C.P、O间距离是7.5m |
D.车从出发到Q所用的时间是9s. |
A.0.5 m/s2 | B.1.0 m/s2 | C.1.5 m/s2 | D.2.0 m/s2 |
A.va=2m/s,vb=4m/s,vc=6m/s |
B.va=2m/s,vb=3m/s,vc=4m/s |
C.va=3m/s,vb=4m/s,vc=5m/s |
D.va=3m/s,vb=5m/s,vc=7m/s |
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