ball vertically up from the ground with initial speed v10 = 6 m/s. At the exact same time,
child #2, throws another ball from height h at an angle = 40° above the horizontal. In the
figure, d = 5 m and h = 1 m. Neglect air resistance and the size of the children. Assume
the acceleration due to gravity has a magnitude of 9.8 m/s².
h
So.. (2)
d
(1)
180
(a) With what initial speed v20 must child # 2 throw their ball for it to strike the other ball
in midair?
Hint: one ball strikes another when their positions are the same.
(b) How much time passes between the moment the balls are thrown and their collision?
(c) At the moment the balls collide, is ball #1 moving up or down? Justify your answer.
Fig: 1