题目内容

某质点沿一圆周运动，质点运动速率越大，意味着切向加速度越大.

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合外力的功为零，合外力的冲量一定为零.

下面表述正确的是

A. 质点作圆周运动，加速度一定与速度垂直
B. 物体作直线运动，法向加速度必为零
C. 轨道最弯处法向加速度最大
D. 某时刻的速率为零，切向加速度必为零

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