A resistor with R = 850 is connected to the plates of a charged capacitor with capacitance

Question:

A resistor with R = 850 Ω is connected to the plates of a charged capacitor with capacitance C = 4.62 µF. Just before the connection is made, the charge on the capacitor is 8.10 mC.
(a) What is the energy initially stored in the capacitor? (b) What is the electrical power dissipated in the resistor just after the connection is made?
(c) What is the electrical power dissipated in the resistor at the instant when the energy stored in the capacitor has decreased to ha1f the value calculated in part (a)?