An object oscillates up and down between y = +A and y = A at the end

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An object oscillates up and down between y = +A and y = −A at the end of a stretched spring. 

(a) At what point(s) is the kinetic energy maximum? (Give the value(s) of y.) 

(b) At what point(s) is the gravitational potential energy maximum? 

(c) At what point(s) is the elastic potential energy maximum? 

(d) At what point(s) is the total potential energy (gravitational + elastic) minimum?

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