A body thrown vertically up with velocity u reaches the maximum height h after T seconds. Which of the following statements is true ?

At height h/2,

v²−u² = −2g(h/2​)

v² = u² − gh

Since final velocity at maximum height h is v= 0,

0 = u²−2gh 

v² = u² − u²/2
$v=u/\sqrt{2}$

v = u − gt

At maximum  height, V=0

At time T, its velocity is 0

T = u/g​  ...................(1)

at time 2T, 

v = u − gt

v = u − g(2T) = u − g×2(gu​)    (from 1)

⇒v = −u