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Why would K(A) be 0?

Yes, it 'released' without initial speed right?

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?

*the

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?

U=mgl

ok, so you would use that formula, h=v^2/2g to get 0.18m?

@Jasminebunnies : Yes

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 ;)