6. A 90.0-kg circus performer jumps from a height 4.80 m onto a trampoline and it stretches 0.20 m. Assume that the trampoline obeys Hooke's Law. How far will it stretch if the performer jumps from a height 8.0 m? m 7. When a 0.38-kg block is suspended on a vertical spring, it causes it to stretch 2.80 cm. If the block is now pulled 7.70 cm below its equilibrium position and released, what is the speed of the block when it is 4.00 cm below the equilibrium position? m/s 8. A grandfather clock uses a pendulum that is 76.0 cm long. It is accidentally broken, and when repaired the length is shorter by 1.90 mm. Treating the clock's pendulum as a simple pendulum, by how much will the repaired clock differ from the correct time every period? ms 9. A vertically mounted spring (k = 850 N/m) is compressed by 24.0 cm relative to its unstrained length. A mass (m = 0.22 kg) is placed at rest against the spring. When the spring is released, the mass is launched vertically in the air. What is the speed of the mass (m) when it passes by a point located 5.68 m above the release point? m/s 10. A 1.45-kg block is pushed against a vertical wall by means of a spring (k = 760 N/m). The coefficient of static friction between the block and the wall is 0.36. What is the minimum compression in the spring to prevent the block from slipping down? cm