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Conservation of Mechanical Energy: A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 1.9m/s. What is the initial height of the bob?

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Why would K(A) be 0?
Yes, it 'released' without initial speed right?

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Other answers:

isnt the initial speed 1.9 m/s?
No, that's the speed at B.
oh ok so you got the zero from A?
Yup :)
but the book says tha answer is 0.18m but how would you get that answer?
I got the same answer. I wrote the formula at the picture:\[h=\frac{v^2}{2g}\]
when it comes to a pendulum does it not depend on the lenght of the string?
ok, so you would use that formula, h=v^2/2g to get 0.18m?
ohhh ok and the zero is put there because there is no mass?
Omg! (^ ^!) Which zero?
lol! the zero in your original equation that you said came from A, in front of mgh
That's because v=0 at highest point.
ohhh ok, is that because it has not been released at that point?
Because by the time the pendulum is released, the velocity is zero. It start from rest.
yes, ok! thank you! I understand now :)
ok ;)

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