如图所示是一列简谐横波在t=0时的波形图,已知这列波沿x 轴正方

如图所示是一列简谐横波在t=0时的波形图,已知这列波沿x 轴正方向传播的波速为20m/s,在t=0.17s时刻,质点P

A.速度和加速度都是沿-y方向    B.速度和加速度都是沿+y方向

C.速度正在增大,加速度正在减小  D.速度正在减小, 加速度正在增大

 

答案

D

解析:

 

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