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To determine which object has particles with the highest average kinetic energy, we need to consider the temperature of each substance, as the average kinetic energy of particles in a substance is directly related to its temperature in Kelvin.
1. **Water at 40°C**: 40 + 273.15 = 313.15 K
2. **Iceberg at 0°C**: 0 + 273.15 = 273.15 K
3. **Drop of water at 90°C**: 90 + 273.15 = 363.15 K
4. **Water at 37°C**: 37 + 273.15 = 310.15 K
Comparing the temperatures in Kelvin:
- Water at 40°C: 313.15 K
- Iceberg at 0°C: 273.15 K
- Drop of water at 90°C: 363.15 K
- Water at 37°C: 310.15 K
The drop of water at 90°C has the highest temperature (363.15 K), which means it has the highest average kinetic energy of its particles.
Therefore, the answer is **a drop of water at 90°C**.