一质点开始时做匀速直线运动，从某时刻起受到一恒力作用。此后，

一质点开始时做匀速直线运动，从某时刻起受到一恒力作用。此后，该质点的动能不可能的是

A. 一直增大

B. 先逐渐减小至零，再逐渐增大

C. 先逐渐增大至某一最大值，再逐渐减小

D. 先逐渐减小至某一非零的最小值，再逐渐增大

答案

解析:略

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