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