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平抛运动是高中阶段最简单也非常重要的曲线运动。化曲为直的思想是解决曲线运动问题的基本思路,灵活掌握运动的规律及推论往往可起到事半功倍的效果。笔者用一道常见的例题加以说明。例题如图1所示,小球以初速度υ_0自倾角为θ的斜坡顶端被水平抛出。若不计空气阻力作用且斜坡足够长,重力加速度为g,试求:(1)小球被抛出多久距离斜坡最远;(2)此时最大距离为多少?
Ping throwing exercise is the most simple high school stage is also very important curve movement. The thought of turning music into a straight line is the basic idea of solving the problem of curvilinear movement. The flexible grasp of the laws and inferences of the movement can often play a multiplier effect. I use a common example to illustrate. Example As shown in Figure 1, the pellet is thrown horizontally at the top of the slope with initial velocity υ_0 from Θ. If the effects of air resistance are not taken into account and the slope is long enough and the gravitational acceleration is g, try: (1) How long is the ball thrown from the slope; (2) What is the maximum distance at this time?