第14届国际物理奥林匹克竞赛试题及解答（英文）
1. Mechanics – Problem I (8 points)
A particle moves along the positive axis (one-dimensional situation) under a force having a projection on , as represented, as function of , in the figure 1.1. In the origin of the axis is placed a perfectly reflecting wall.
A friction force, with a constant modulus , acts everywhere on the particle.
The particle starts from the point having the kinetic energy .
a. Find the length of the path of the particle until its’ final stop
b. Plot the potential energy of the particle in the force field .
c. Qualitatively plot the dependence of the particle’s speed as function of its’ coordinate.

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