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26. A particle is in motion according to the equation 
y = (60 cm) cos (8t + π/8) 
where t is in seconds. Find the speed of the particle when it is at a point 20 cm from the equilibrium position. Answers in cm/s.
(A) 453
(B) 56.6
(C) 320
(D) 142


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 【站僕】摩檸Morning:有沒有達人來解釋一下?
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26. A particle is in motion according to..-阿摩線上測驗