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首先,运用匀变速直线运动规律处理问题,应当先明确以下几个要注意的问题:1.正负号的规定匀变速直线运动的基本公式均是矢量式,应用时要注意各物理量的符号,一般情况下,我们规定初速度的方向为正方向,与初速度同向的物理量取正值,反向的物理量取负值.2.匀变速直线运动物体先做匀减速直线运动,减速为零后又反向做匀加速直
First of all, to solve the problem with uniform linear motion law, we should first clarify the following issues that should be paid attention to: 1. The provision of positive and negative signs The basic formula for uniform linear motion is vector type, and attention should be paid to the sign of each physical quantity when applied. Under normal circumstances, we specify that the direction of the initial speed is positive. The physical quantity in the same direction as the initial speed is taken as a positive value, and the physical quantity in the reverse direction is taken as a negative value. 2. The uniform linear motion of the linear moving object is firstly decelerated and linearly decelerated, and the deceleration is zero. Afterwards, it is evenly accelerated in the reverse direction.