you place a book on top of a spring and push down, compressing the spring by 10 cm. when you let go of the book, it is pushed up by the spring. which statement describes what happens to the energy of the spring-book system?

a. the elastic potential energy of the system decreases.
b. the gravitational potential energy of the system decreases.
c. the kinetic energy of the system decreases.
d. the total energy of the system increases.

Could someone . i have tried to solve myself but my calculation is off

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s