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The function x = (8.0 m) cos[(4πrad/s)t + π/5 rad] gives the simple harmonic motion of...

The function x = (8.0 m) cos[(4πrad/s)t + π/5 rad] gives the simple harmonic motion of a body. At t = 6.9 s, what are the (a) displacement, (b) velocity, (c) acceleration, and (d) phase of the motion? Also, what are the (e) frequency and (f) period of the motion?

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