A rubber-band slingshot shoots a 25g stone. When answering 2a below, remember that Ep=1/2kx^2 and, because F=kx, Ep=1/2Fx.
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?
b) How high will the stone rise if it is shot straight upward?