Motion Under Gravity

(ii)Time of ascent (t_a):
"For a body projected upwards the time to reach the maximum height is called time of ascent"
Expression :
Let a body be projected vertically upwards with initial velocity u.
we know that,v=u+at
    Here a=-g,  t=t_a,  v=0
    0=u-gt_a
    u=gt_a
    \( \therefore t_a = \frac{u} {g} \)