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A slingshot consists of a light leather cup, containing astone, that is pulled back against two parallel rubber bands. Ittakes a force of 15 N to stretch either one of these bands 1.0cm.

(a) What is the potential energy stored in the two bands togetherwhen a 50-g stone is placed in the cup and pulled back 0.20 m fromthe equilibrium position?

(b) With what speed does the stone leave the slingshot?

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