To determine how many ornaments Joy will make this weekend, we first need to find her rate of making ornaments.
Joy made 2 ornaments in 6 hours. Thus, her rate of making ornaments is:
\[ \text{Rate} = \frac{\text{Number of ornaments}}{\text{Time in hours}} = \frac{2 \text{ ornaments}}{6 \text{ hours}} = \frac{1}{3} \text{ ornaments per hour} \]
Now, if Joy plans to spend a total of 15 hours making ornaments this weekend, we can calculate the total number of ornaments she will make by multiplying her rate by the total time:
\[ \text{Total ornaments} = \text{Rate} \times \text{Total time} = \left(\frac{1}{3} \text{ ornaments per hour}\right) \times (15 \text{ hours}) = 5 \text{ ornaments} \]
Thus, Joy will make 5 ornaments this weekend.