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.

Amoving company collects data about couches they move and displays the data in a table. the force along the ramp, the angle of the ramp, and the height the couch is raised to are shown. which statements correctly compare the work done to move the couches? check all that apply. the same amount of work is done for couches 1 and 3. the same amount of work is done for couches 2 and 3. the work for couch 1 is greater than the work for couch 2. the work for couch 2 is less than the work for couch 3. the work for couch 3 is greater than the work for couch 1. the work for couch 2 is greater than the work for couch 1.