We use Charles's law to solve the exercise
Volume and temperature have a directly proportional relationship when pressure is constant.
[tex]\text{V}_1\text{T}_2\text{ }=\text{ V}_2\text{ T}_1[/tex]Where
V1=10L
T1=5K
V2=4L
Solving for T2
[tex]\text{ T}_2\text{ = }\frac{\text{ V}_2\text{ T}_1}{\text{ V}_1}=\frac{4\text{ L }\times\text{ 5K}}{10\text{ L}}=2\text{ K}[/tex]The answer is 2K
