如果物体在复合场中所受到的力均为恒力,那么物体所受的合力也为恒力.将这个合力视为等效重力,复合场问题就可以转化为重力场问题了. 1.斜抛运动例1 在电场强度为E的水平电场中,以初速度v_0竖直向上抛出一个质量为m、电量为q的小球,求小球在运动过程中的最小速度为 If the force received by the object in the composite field is constant, then the resultant force of the object is also a constant force. Considering this resultant force as equivalent gravity, the problem of the composite field can be transformed into a gravitational field problem. Example of throwing motion 1 In a horizontal electric field with an electric field strength of E, throw a small ball with mass m and power q vertically upward at the initial velocity v_0. Find the minimum velocity of the ball during the motion.