Answer: bring real GDP back to potential GDP more quickly but would result in a permanently higher price level.
Step-by-step explanation:
When the government uses fiscal policy to bring real GDP back to the potential GDP, the movement back to potential GDP occurs faster because the spending by government increases the aggregate demand in the economy much more faster.
A higher price level would be formed permanently however because the spending by government would lead to aggregate demand rising such that prices need to rise in order to reflect that goods are now more scarce in relation to demand.