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Chapter 16 - 16.13

13. We use v m = ωx m =2 πfx m , where the frequency is 180 / (60 s) = 3 . 0 Hz and the amplitude is half the

stroke, or x m =0 . 38 m. Thus, v m =2 π (3 . 0 Hz)(0 . 38 m) = 7 . 2m / s.