KATZPSEF1 16.P.005. (Need Help with Physics Homework)

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Question

KATZPSEF1 16.P.005. (Need Help with Physics Homework)

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I used

y(t)= −0.0845 cos(11.0t − 6.45) m to solve position for 1a, 1b, and 1c

ay(t) =10.2 cos(11.0t − 6.45) m/s^2 to solve velocity for 1a, 1b, and 1c, and

used vy(t) = (0.930 m/s)sin(11.0t − 6.45) to solve acceleration for 3a, 3b, and 3c.

As a result,

I got a question, 1a, and 1b correct. But how come I got 1c completely wrong. What formula will help me to get the right answer?

Can you provide me solution for 1c with step by step and proper formula to get into the correct answer PLEASE!

Thanks.

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