You step into an elevator holding a glass of water filled to a depth of 7.9 cm. After a moment, the elevator moves upward with constant acceleration, increasing its speed from 0 to 2.4 m/s in 2.9 s.

(a) During the period of acceleration, is the pressure exerted on the bottom of the glass greater than, less than, or the same as before the elevator began to move? Explain.

(b) Find the change in the pressure exerted on the bottom of the glass as the elevator accelerates?