1. 320 N force is applied to a horizontal spring which stretches it by 7 cm cm to the left. What is the spring constant of this spring? 

2. A 763 g mass is placed on top of a spring. The other end of the spring is attached to the floor. You also push down on the mass with a force of 2.1 N. The spring moves downward a total of 0.079 m from its equilibrium position.

Find the spring constant of this spring.