A level 高中力学运动学计算.这是Alevel数学.（带翻译）A particle of mass 0.1kg is at rest at a point A on a rough plane inclined at 15 degrees to the horizontal.The particle is given an initial velocity of 6m/s and starts to move up a
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A level 高中力学运动学计算.这是Alevel数学.（带翻译）A particle of mass 0.1kg is at rest at a point A on a rough plane inclined at 15 degrees to the horizontal.The particle is given an initial velocity of 6m/s and starts to move up a
A level 高中力学运动学计算.
这是Alevel数学.（带翻译）
A particle of mass 0.1kg is at rest at a point A on a rough plane inclined at 15 degrees to the horizontal.The particle is given an initial velocity of 6m/s and starts to move up a line of greatest slope of the plane.the particle comes to instantaneous rest after 1.5s.
1.find the coneffiecient of friction between the paricle and the plane.
2.shou that,after coming to instantaneous rest,the particle moves down the plane.
3.find the speed with which the particle passes through A during its downward motion.
中文大体翻译
一0.1千克的质点在一个粗糙的15度的斜面上的A点保持平衡.给予这个质点向上的初速度6m/s,质点开始移动直到斜面最高点.1.5秒后质点到达一个停顿瞬间（应该就是v等于0）
算出摩擦系数
说明,在停顿之后,质点向下移动
算出在质点下降到A时的速度
A level 高中力学运动学计算.这是Alevel数学.（带翻译）A particle of mass 0.1kg is at rest at a point A on a rough plane inclined at 15 degrees to the horizontal.The particle is given an initial velocity of 6m/s and starts to move up a
摩擦系数为（4-gsin15°）/(gcos15°)数值自己算,
am=f+mgsin15°
f=uN=umgcos15°
at=6
然后就得解了.
算到A点的速度可以用能量算,也可以用运动状态算,随你,就选个会的方法算,摩擦系数知道了就不难算了.
应该是0，因为向上运动时摩擦力向下，向下运动时摩擦力向上，所以在最高点摩擦力为0，再运用动能定里理就解出来了！
好好看书，哎，这个问题真不知道。
m(gxsin15'+ugcos15')xT=mv
得；u=
，umgcos15'+1/2mVt^2=1/2mV。^2
得Vt=
你要是高中生，这题不可能做不来，公式子此，要答案，自己动手算。