B is correct since 2X0.015 m = 0.03 m

C is correct: w = 2p /T = 150. Therefore T = 2p /150 = 0.042 s

D is not correct: k = 2p /l , l = 2p /15 = 0.42m. v = fl = (0.42)(1/.042) = 10 m/s

E is correct: See value of l in previous line.

Answer is D

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