(a) With what speed must a ball be thrown vertically from ground level to rise to a maximum height of ? (b) How long will it be in the air ?

1 Answer
Feb 13, 2016

t_f=2*v_i/g " flying time"
h_max=(v_i^2)/(2*g)

Explanation:

v_f=v_i-g*t
v_f=0 " if object reaches to maximum height"
v_i=g*t
t=v_i/g " elapsed time to reach of maximum height"
t_f=2*v_i/g " flying time"
v_i^2=2*g*h_max
h_max=(v_i^2)/(2*g)