A water tank is in the shape of a cone with base radius 2 m and altitude 3 m. The circular base is flat against the ground. If the tank is full, which integral represents the work (in Joules) needed to pump all the water out through the top of the tank? (a) 9800 (2-2y/3)(3-y)dy (c) 9800m (3-y)dy (b) 9800m f 4(3-y)dy (d) 9800 6ydy