6. If 50 N of force is required to compress a spring by 0.25 m, what is the value of the spring constant? a. 200 N/m b. 400 N/m C. 800 N/m d. 1600 N/m 7. How much potential energy is stored in the spring from question 6 once it is compressed? Use the spring constant you calculated in question 6. a. 5J b. 6.25 J C. 7.5 J d. 8.75 J For questions #8-9, consider the following scenario and diagram: Two balls (A and B) of equal mass are released from rest at the heights indicated on the diagram. (m) 40 30 20 10 8. Compare the E, of B to the E, of A. The E, of B is the E, of A. a. Equal to b. 2 times greater than C. 2 times less than d. 4 times greater than 9. Compare the E, of B at the top to the Ex of B right before it hits the ground. The E, of B is the Ex Of B a. Greater than b. Less than c. Equal to d. Not enough information to solve the