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I've got a problem to solve, but I'm really new to this topic and I'm having a bit of trouble knowing where to start.

Here's the question I'm working on:

A mass = 1.5 kg attached to a spring with k=8 N/m on a horizontal surface with friction force -b(dx/dt) where b = -230g/s

The mass is pulled a distance 12cm and then released.

1- What is the time required for the amplitude of the oscillations to drop to 4cm?

2- How many oscillations are made by the mass in this time?

Could anyone point me in the right direction?

Thanks