A slingshot consists of a light leather cup containing a stone. The cup is pulled back against two parallel rubber bands. It takes a force of 15 N to stretch either one of these bands 1.0 cm. (a) What is the potential energy stored in the two bands together when a 49-g stone is placed in the cup and pulled back 0.10 m from the equilibrium position? J (b) with what speed does the stone leave the slingshot? m/s

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