Arturo O. answered • 04/27/18

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s(t) = a cos(ωt)

s(0) = -5 = a cos(0) = a ⇒

s(t) = -5 cos(ωt),

s(t) in inches

ω = 2π/P = 2π/2.5 rad/s = ? rad/s

s(t) = -5 cos[(2π/2.5)t],

with t in seconds and s(t) in inches.