An object undergoes simple harmonic motion with a frequency of `1.6 H z` and an amplitude of 4 mm. What is the acceleration at the maximum displacement from equilibrium ? What is the acceleration 0.4 seconds later?

Explanation

To solve the problem step by step, we will break it down into two parts: finding the acceleration at maximum displacement and finding the acceleration 0.4 seconds later.

### Step 1: Calculate the angular frequency (ω)
The angular frequency (ω) can be calculated using the formula:
\[ \omega = 2\pi f \]
where \( f \) is the frequency. Given \( f = 1.6 \, \text{Hz} \):
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