Use gravitational acceleration, g = 9.81 m s-² 1. If it takes 4.00 of work to stretch a spring 10.0 cm from its initial length, determine the extra work required to stretch it an additional 10.0 cm. ANS.: 12.0 J 2. A book of mass 0.250 kg is placed on top of a light vertical spring of force constant 5000 N m-¹ that is compressed by 10.0 cm. If the spring is released, calculate the height of the book rise from its initial position. ANS.: 10.2 m 3. A 60 kg bungee jumper jumps from a bridge. She is tied to a bungee cord that is 12 m long when unstretched and falls a total distance of 31 m. Calculate a. the spring constant of the bungee cord. b. the maximum acceleration experienced by the jumper. ANS.: 100 N m¹; 22 m s2 4. A spring is suspended vertically with a load of 0.8 kg from a retort stand. The spring will extend by 20.0 cm if a force of 15.0 N is applied at its end. Calculate a) The maximum extension produced by the load, 0.8 kg b) The potential energy stored in the spring at the maximum extension ANS.: x= 10.5 cm; E= 0.41 J 50​