A ball is thrown vertically upward with a
speed of 27.9 m/s from a height of 1.9 m.
How long does it take to reach its high-
est point? The acceleration of gravity is
9.81 m/s2.
Answer in units of s
at the top, vf in the vertical is zero.
Vf=vi+gt
0=27.9-9.8 t solve for t.