1. 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.
2. Two balls of equal mass 9.25 kg undergo a collision. Initially, one ball is moving at a velocity of 12.0 m/s [E]. The other ball is moving directly west with a kinetic energy of 1850 J. After the collision, one ball is moving at 6.50 m/s [N 8 E]. What is the velocity of the other ball after the collision?
3. Explain, with reference to Hooke's law, how spring constants that are larger or smaller may be safer in different situations.