Write the word or phrase that best completes each statement or answers the question. -The position of a cart that is oscillating on a spring is given by the equation x

Write the word or phrase that best completes each statement or answers the question.
-The position of a cart that is oscillating on a spring is given by the equation x = (12.3 cm)
cos[(1.26 s-1)t]. When t = 0.805 s, what are the (a) velocity and (b) acceleration of the cart?

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