A body projected vertically with a velocity 'u' from ground. Its velocity

A body projected vertically with a velocity 'u' from the ground. Its velocity (a)At half of maximum height u/2 b) At 3//4^(th) of maximum height u/sqrt2 (c) At 1//3^(rd) of maximum height sqrt(2/3)u (d) At 1//4^(th) of maximum height sqrt3/2u

A body is projected vertically up with velocity u from the ground in the presence of constant air resistance R of it reaches the ground with a velocity 'V' then time of descent

A body is projected vertically up with a valocity u. its velocity at ghalf of its maximum height and at 3//4th of its maximum height are.