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?

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?