A small block is oscillating on a spring with a period of 3.05 s. At t = 0 the mass has zero speed and is at x = 4.35 cm. What is the magnitude of the acceleration at t = 4.30 s?
The Attempt at a Solution
which I've been told is wrong.
I have no idea what I'm doing wrong, I'm sure it's something painfully obvious but I just can't figure it out.