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is described by

x(t)=A e^t/τ cos(ώt + delta)

where τ is the time constant, A the initial amplitude and delta an arbitrary phase.

(a) Find an expression for the speed of the mass as it passes through the equilibrium

position.

*Can anyone give me an idea on how to start solving this problem. I haven't tried anything because i don't know where to start.

thank you