The following equation is the rate water level ( y in feet) changes with time ( t in minuts) in a vertical cylindrical tank when a valve at the bottom of the tank is open. Assuming k = 0.1 and an initial water level of 9ft, determine the value of y when t = 2 minute using Euler Method. Determine the analytical expression for y and compare its value with the numerical solution at t = 2 minute. Use a time step of 0.5 minute.