Hi guys, Revision for an exam tomorrow, I hope someone can help? I've been given the answers but I can't work out how to find the damping ratio without being given a velocity or distance for the mass to travel? A mass of 6kg is suspended on a spring and set oscillating. it is observed that amplitude reduces to 5% of its initial value after 2 oscillations, which takes 0.57 seconds. Determine the following. The damping ratio (0.43) The natural frequency (3.51) The actual frequency (3.17) The spring stiffness (2915N/m) The critical damping coefficient (264.5Ns/m) The actual damping coefficient (113.7Ns/m) I can use the damping ratio to help solve some of the other values once I know how to work it out. Any help appreciated.