When the rubber bands of the sling shot are pulled back, each rubber band is stretched 3 in. the natural length and the stiffness of each rubber band are 6 in. and 10 lbf/in, repectively. The mass of the pellet is 200 grains. determine the maximum amount of energy that the pellet can attain (lbf-ft) and determine the impuls applied on the pellet (lbs-s).