题目

September 21, 2050----At a press conference today it was announced that the first tourist heading for Mars will be the 38-year-old US businessman Patrick Clifford. He will leave the earth in the  launching window of June 2052 and set his foot on the surface of Mars in November, together with the other 6 astronauts assigned for the mission to further explore the planet. Patrick has now two years of training ahead of him to get ready for the trip. Not only will he spend five months in getting to Mars, but another 600 days there before he can go back home.  Patrick was of course very exci如图所示，粗糙程度均匀的绝缘斜面下方O点处有一正点电荷，带负电的小物体以初速度v1从M点沿斜面上滑，到达N点时速度为零，然后下滑回到M点，此时速度为v2（v2＜v1）．若小物体电荷量保持不变，OM=ON，则小物体上升的最大高度h为多少？（重力加速度为g）