If a stone projected from ground, takes $4 \,s$ to reach the topmost point of its trajectory, then time of flight is .......... $s$
$4$
$8$
$2$
$10$
(b)
Total Time $=A B+B A$
$=4+4$
$=8$
A man throws a ball vertically upward and it rises through $20 \;m$ and returns to his hands. What was the initial velocity $(u)$ of the ball and for how much time $(T)$ it remained in the air $[g = 10\,m/{s^2}]$
A body freely falling from the rest has a velocity $‘v’$ after it falls through a height $‘h’$. The distance it has to fall down for its velocity to become double, is
A ball is thrown vertically downward with a velocity of $20\; m / s$ from the top of a tower. It hits the ground after some time with a velocity of $80\, m / s$. The helght of the tower is $……m$ : $\left( g =10\, m / s ^{2}\right)$
Free-fall : Discuss the motion of an object under free fall. Neglect air resistance.
A juggler throws balls vertically upwards with same initial velocity in air. When the first ball reaches its highest position, he throws the next ball. Assuming the juggler throws $n$ balls per second, the maximum height the balls can reach is
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