(i)Time of ascent (ta) :
"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=ta,v=0
\(\therefore\)0=u-gta
\(\therefore\) u=gta
\(
\therefore t_a = \frac{u}
{g}
\)