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A mass M attached to a string of length L forms a simple pendulum. The coordinate...

A mass M attached to a string of length L forms a simple pendulum. The coordinate system is chosen such that the motion to the right is the positive direction. At t=0, the mass is traveling to the right through equilibrium, with amplitude of oscillation A. Write down the symbolic sinusodial time dependence for position x(t). Your answer should only be in terms of: A, g, L and t. Include minus signs and trigonometric functions as needed.
A.) x(t)=?
x(t)=-Asin(wt)=Asin((sqrt(g)/L)*t)
Now take your results from part a to determine the numerical value of position at t=3.00 s. Take A=20.0 cm, and L=4.25 m.
B.) x(t=3.00s)=?
I got x=17.7 cm but this is wrong.

C.) What is the maximum speed of the pendulum? What is the first time after t=0 that this max speed will occur?

I only need the answers for part B and C, especially part C.
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