A series RC circuit, with R = 1 k and C = 20 F, has an initial

A series RC circuit, with R = 1 kΩ and C = 20 μF, has an initial charge Q₀ on the capacitor at the time the switch is closed, which results in applying a constant-voltage source V = 50 V. If the resulting current is i = 0.075e^−50t (A), find the charge Q₀ and its polarity.