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**1. The problem statement, all variables and given/known data**

A simple pendulum has a mass of 0.250 kg and a length of 6.00 m. It is displaced through an angle of 10.0° and then released. Solve this problem by using the simple harmonic motion model for the motion of the pendulum.

(a) What is the maximum speed?

(b) What is the maximum angular acceleration?

(c) What is the maximum restoring force?

**2. Relevant equations**

1[tex]\stackrel{}{}2[/tex]mv[tex]^{}2[/tex] = mgh

this is kinetic energy = potential energy.

**3. The attempt at a solution**

I tried using the above equation to find maximum speed, but I found that I was getting the wrong answer because I used arc length in the height variable instead of the actual height.

So I guess I'm asking.. how to find height?

Do I use some Pythagorean?

Or just some algebra/trig.. -.-

and also.. what it means "maximum resisting force"?