一、选择题1.“蹦极”是一项比较刺激的运动.某人身系弹性绳自高空p点自由下落,如图1所示.a点是弹性绳的原长位置,c点是人所能到达的最低点,b点是人静止地悬吊着时的平衡位置.不计空气阻力,则下列说法中正确的是A.从a点至b点的过程中,加速度方向与速度方向相反B.从p点至c点的过 First, multiple-choice questions 1. “Bungee jumping” is a relatively stimulating exercise. Somebody’s bouncy elastic rope is free to fall from high point p, as shown in Figure 1. Point a is the original long position of the elastic cord, and point c is the person’s position. The lowest point that can be reached, point b is the equilibrium position when the person is suspended statically. Regardless of air resistance, the correct thing in the following statement is A. In the process from point a to point b, the direction of acceleration is opposite to the direction of velocity B . From point p to point c