Problem also in attached file.
The energy stored by a 1 mf capacitor used in a laser power supply is given as W=4e(-10t) J for T>=0. find the capacitor voltage at T=0.1 sec.
The energy in a capacitor is equal to 0.5 * C * V ^ 2.
At T = 0.1 ...
This solution calculates the capacitor voltage at a certain time given the energy stored in the capacitor at time t = 0.