An object is thrown vertically upwards. At its maximum height,which of the following quantities becomes zero?

$A$ body falls from rest. Its velocity at the end of the first second is ......... $ft/sec$ $(g = 32 ft/sec^2)$.

Four marbles are dropped from the top of a tower one after the other with an interval of one second. The first one reaches the ground after $4$ seconds. When the first one reaches the ground,the distances between the first and second,the second and third,and the third and fourth marbles will be respectively:

The ratio of the displacements of a freely falling body during the second and fifth seconds of its motion is

The ratio of times taken by a freely falling body to travel the first $5 \ m$,second $5 \ m$,and third $5 \ m$ distances is:

From a tower of height $H$, a particle is thrown vertically upwards with a speed $u$. The time taken by the particle to hit the ground is $n$ times that taken by it to reach the highest point of its path. The relation between $H, u$ and $n$ is: