Max velocity of simple pendulum

[golgiapparatus88]

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I'm trying to relate kinetic and potential engery to a pendulum and I need help with a simple concept I am not understanding

KE = PE
1/2mv^2 = 1/2kA^2 where A is the amplitude

Vmax= A(k/m)^1/2

Why is the A suddenly not part of the square root? I'm thinking it has to do with it being at the minimum displacement but wouldn't A be zero then?

 

[lDanny]

i'm trying to relate kinetic and potential engery to a pendulum and i need help with a simple concept i am not understanding

ke = pe
1/2mv^2 = 1/2ka^2 where a is the amplitude

vmax= a(k/m)^1/2

why is the a suddenly not part of the square root? I'm thinking it has to do with it being at the minimum displacement but wouldn't a be zero then?

(a^2)^1/2 = a

 

[golgiapparatus88]

haha oh man did I think too hard on that one. Thanks for responding!