Physics Help Forum A rubber-band slingshot shoots a 25 g stone. When answering 2a below, remember that

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 Jul 16th 2014, 01:44 PM #1 Junior Member   Join Date: Jul 2014 Posts: 5 A rubber-band slingshot shoots a 25 g stone. When answering 2a below, remember that A rubber-band slingshot shoots a 25 g stone. When answering 2a below, remember that Ep = ½ kx2 and, because F = kx, Ep = ½ Fx, you will need to use the average force which is obtained by dividing the maximum force by two. a.What is the initial speed of the stone if the rubber band is drawn back 0.15 m with a maximum force of 27 N?
 Jul 16th 2014, 02:05 PM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,352 You've been given a technique to calculate the elastic potential energy of the stretched rubber band. Now apply conservation of energy - that potential energy is converted to kinetic energy of the stone when it's fired. You should already know that kinetic energy of a moving object is: KE =(1/2)mv^2 Set KE=Ep and solve for v.

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