A newspaper boy throws papers sideways onto the porches of his customers while riding his bicycle along the sidewalk. The sidewalk is 15 meter in front of the porches. The boy throws the papers at a horizontal speed of 6.0 m/s relative to him, and rides the bicycle at a speed of 4.0 m/s relative to the sidewalk.
(a) Find with what horizontal speed do the papers actually travel relative to the ground?
(b) Obtain how far in advance of a porch should the boy throw a paper, so that it lands on target?
(c) If he waits until he is directly opposite a porch, find at what horizontal angle with respect to the sidewalk will he have to throw the paper, to hit the porch?