- #1
Bread Boy
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Homework Statement
A 2.0kg bob of a pendulum is held at an angle of 55 degrees from the vertical. When released it reaches a maximum speed of 3.5m/s. What is the length of the pendulum arm?
Homework Equations
Ek = 1/2mv^2
Ep = mgh
The Attempt at a Solution
1/2 * 2 * 3.5 ^ 2 = 12.25 J
12.25 = 2(9.8)h
h = 0.625
That's as far as I can get. I know that the length of the pendulum arm is 0.625 plus "length - 0.625" but I'm stuck there. Help would be much appreciated :)
Thanks in advance!