1. Explain, with reference to Hooke's law, how spring constants that are larger or smaller may be safer in different situations.

2. Two objects, one with no kinetic energy and the other with 180 J of kinetic energy, collide. After the collision, the first object has a velocity of 12.0 m/s [E]. What other information would you need to collect to determine whether this collision is elastic or inelastic, what calculations would you perform, and how would you decide?

3. A mass is attached to a spring with a spring constant of 8000 N/m. The spring and mass are set into simple harmonic motion on a frictionless horizontal surface. The period of vibration is 2.300 s. Calculate the object's mass, and explain when it has the most kinetic energy and the most elastic potential energy.