1. The problem statement, all variables and given/known data The function x = (4.5 m) cos[(6∏ rad/s)t + ∏/3 rad] gives the simple harmonic motion of a body. At t = 1.6 s, what are the (a) displacement, (b) velocity, (c) acceleration, and (d) phase of the motion? Also, what are the (e) frequency (in Hz) and (f) period of the motion? 2. Relevant equations x(t)=xmcos(ωt+ϕ) v(t)=-ωxmsin(ωt+ϕ) a(t)=-ω2xmcos(ωt+ϕ) 3. The attempt at a solution I'm just trying to get the first problem! How is it incorrect to do 4.5cos(6∏(1.6)+∏/3)=3.84m? I've tried all different amounts of sigfigs; can someone enlighten me? And I wouldn't hate tips on the rest of the problem besides just a. Thank you!