1. **Problem (a):** A metal object moves 3 ticks forward and then 3 ticks backward. Determine its final position relative to the original. 2. **Formula and concept:** The net displacement is the sum of all movements, considering forward as positive and backward as negative. 3. **Calculation:** $$3 + (-3) = 3 - 3 = 0$$ 4. **Interpretation:** Since the net displacement is zero, the object is at its original position. This means the correct answer is: The item is at its original position.