A 2 kg block iks placed over a 4 kg block and both are plced on a smooth horizontal surfae. The coefficient of friction between the blocks is 0.20. Find theacceleration of the two blocks if a horizontal force os 12 N is applied to a. the upper block, b. the lower block. Take `g=10 m/s^2`.

Explanation

To solve the problem, we will analyze the two scenarios separately:

### Part A: Force applied to the upper block

1. **Identify the masses and forces**:
- Mass of the upper block (m1) = 2 kg
- Mass of the lower block (m2) = 4 kg
- Coefficient of friction (μ) = 0.20
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