Enter as many values of the instantaneous velocity of the curved part of the position-time graph as needed and draw the velocity-time curve.

• （根据需要输入位置-时间图线中曲线部分所有需要的瞬时速度，然后画出速度-时间图线。）输入??这里是讲根据一个图象画出另一个图象的~~用“输入”怪怪的！