Tom has built a large slingshot, but it is not working quite right. he thinks he can model the slingshot like an ideal spring with a spring constant of 45.0 n/m. when he pulls the slingshot back 0.235 m from a nonstretched position, it just does not launch its payload as far as he wants. his physics professor "" by telling him to aim for an elastic potential energy of 14.5 j. tom decides he just needs elastic bands with a higher spring constant. by what factor does tom need to increase the spring constant to hit his potential energy goal?