A cannonball shot horizontally from the top of a cliff with an initial velocity of 425m/s is aimed towards a schooner on the ocean below. If the cliff is 78m above the ocean surface, calculate the following:

a) the time for the cannonball to reach the water

b) horizontal displacement of the cannonball

c) final velocity

Can someone please help me with part c).... the final answer is suppose to be $\displaystyle 4.3 x 10^2m/s$[E 5.3deg N]

thanks