F |
m |
kx0 |
m |
1 |
2 |
|
μmg |
k |
kx0 |
m |
|
μmg |
k |
A.xA=h,aA=0 | B.xB=h+
| ||||
C.xC=h+2
| D.xD=h+2
|
A.15N | B.20N | C.25N | D.30N |
A.物体运动到O点时所受合力为零,速度最大 |
B.物体从A到O点先加速后减速 |
C.物体从A到O做加速运动,从O到B做减速运动 |
D.物体从A到O的过程加速度逐渐减小 |
A.a1=a2,F1>F2 | B.a1=a2,F1<F2 |
C.a1=a2,F1=F2 | D.a1>a2,F1>F2 |
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