Answer:
If E is the translational K.E. per unit volume, then \[P=\frac{2}{3}E\] or \[E=\frac{3P}{2}\] Total translational K.E. of volume V is \[EV=\frac{3PV}{2}=500J\] When pressure becomes 2P, total translational K.E. \[=2\times 500=\mathbf{1000J}\]
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