Physics (Kinematics)
posted by Joy .
A ball is thrown 83.3 m upward and then falls
back to earth.Neglecting air resistance, how long will it
be in the air? The acceleration of gravity is
9.8 m/s2 .
Answer in units of s

hf=hi+vi*t4.9 t^2
hf, hi =0
solve for t.