1. **State the problem:** Simplify the given masses: 0.5 kg, 1 kg, and 600 grams. 2. **Convert all masses to the same unit:** We will convert grams to kilograms since 1 kg = 1000 grams. 3. **Convert 600 grams to kilograms:** $$600 \text{ grams} = \frac{600}{1000} \text{ kg} = 0.6 \text{ kg}$$ 4. **Add all masses in kilograms:** $$0.5 \text{ kg} + 1 \text{ kg} + 0.6 \text{ kg} = 2.1 \text{ kg}$$ 5. **Final answer:** The simplified total mass is **2.1 kg**.