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**The two masses shown are at rest, and the pulleys are frictionless. What does the scale read in kilograms?**

*Diagram Description:*
The image features a schematic of a pulley system where a spring scale is attached to a pulley. Underneath the pulley, two masses of 5 kg each are hanging vertically. The system is set at equilibrium, meaning the forces are balanced.

*Question:*
Select one or more:

- [ ] a. 10 kg
- [ ] b. 7.1 kg
- [ ] c. 0 kg
- [ ] d. 5 kg
- [ ] e. None of these choices.

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