i) A car of 950 kg hits a huge spring at a speed of 22 m/s, compressing it 5.0 m. Determine the spring constant of the spring and determine how long is the car in contact having the spring before it bounces off in the opposite direction?
ii) A simple pendulum oscillates having frequency f. Determine its frequency when it is accelerated at 0.5g (a) upward (b) downward?