某质点在恒力F作用下从A点沿如图所示曲线运动到B点,到达B点后,

某质点在恒力F作用下从A点沿如图所示曲线运动B点,到达B点后,质点受到的力大小不变,但方向恰与F相反,则它从B点开始的运动轨迹可能是图中的哪条曲线

A.曲线a               B曲线b

C曲线c               D以上三条曲线都不可能

答案

A

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