From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 8.60 m/s and angle of 16.0° below the horizontal. it strikes the ground 4.00 s later.
(a) if the base of the building is taken to be the origin of the coordinates, with upward the positive y-direction, what are the initial coordinates of the ball? (use the following as necessary: y0. assume si units. do not substitute numerical values; use variables only.)
xi =

yi =

(b) with the positive x-direction chosen to be out the window, find the x- and y-components of the initial velocity.
vi, x =
m/s
vi, y =
m/s

(c) find the equations for the x- and y-components of the position as functions of time. (use the following as necessary: y0 and t. assume si units.)
x =
m
y =
m

(d) how far horizontally from the base of the building does the ball strike the ground?
m

(e) find the height from which the ball was thrown.
m

(f) how long does it take the ball to reach a point 10.0 m below the level of launching?
s