When a rubber band is stretched by a distance x, it exerts a restoring force of magnitude F = ax + bx2, where a and b are constants. The work done in stretching the unstretched rubber band by L is

1) aL2 + bL3

2)

3) 

4)   

A bungee cord is 30.0 m long and, when stretched a distance x, it exerts a restoring force of magnitude,  . Your father-in-law (mass 95.0 kg) stands on a platform 45.0 m above the ground, and one end of the cord is tied securely to his ankle and the other end to the platform. You have promised him that when he steps off the platform he will fall a maximum distance of only 41.0 m before the cord stops him. You had several bungee cords to select from, and you tested them by stretching them out, tying one end to a tree, and pulling on the other end with a force of 380.0 N. When you do this, what distance will the bungee cord that you should select have stretched?

Spring has an unstretched length of 10cm

Ques:

Spring has an unstretched length of 10 cm. It exerts a restoring force F when stretched to a length of 11 cm. For what total stretched length of the spring is its restoring force 3F? At what compressed length is the restoring force 2F?

A spring has an unstretched length of 10 cm. It exerts a restoring force F when stretched to a length of 11 cm. For what total stretched length of the spring is its restoring force 3F?