麻烦帮解一道英文版物理题
问题描述：
麻烦帮解一道英文版物理题
A box of mass 2kg is pulled up a rough plane face by means of a light rope.The plane is inclined at an angle 20°to the horizontal,as shown in the figure.The tension in the rope is 18N .The coefficient of friction between the box and the plane is 0.6 by modelling the box as a particle,find
1 the normal reaction of the plane on the box
2 the acceleration of the box
答
图呢……
算了帮你翻译一下
一个倾角为20度的斜面上有一个2kg的箱子（视作质点）,该箱被一轻绳拉着,绳上张力为18N.箱子与斜面间的动摩擦因数为0.6
（1）斜面对箱子的正压力
（2）箱子的加速度
应该不难做,你不给图我怎么知道绳子怎么拉的……