A boy throws a stone horizontally from the top of a cliff of height h toward the ocean below. The stone strikes the ocean at distance d from the base of the cliff. In terms of h, d, and g, find expressions for the following.
(a) the time t at which the stone lands in the ocean
t = ?
(b) the initial speed of the stone
vxi = ?
(c) the speed of the stone immediately before it reaches the ocean
vf = ?
(d) the direction of the stone's velocity immediately before it reaches the ocean
?f = below the horizontal