A ball is thrown vertically upward with an initial velocity of $150\,m / s$. The ratio of velocity after $3\,s$ and $5\,s$ is $\frac{x+1}{x}$. The value of $x$ is $………..$ Take $\left(g=10\,m / s ^2\right)$

Two bodies of masses $1 kg$  and $5 kg$  are dropped gently from the top of a tower. At a point $20 cm$  from the ground, both the bodies will have the same

A ball is thrown vertically upwards from the ground $G$ with a speed $u$. It reaches a point $B$ at a height $h$ (lower than the maximum height) after time $t_1$. It returns to the ground after time $t_2$ from the instant it was at $B$ during the upward journey. Then $t_1t_2$ is equal to

Time taken by an object falling from rest to cover the height of ${h_1}$ and ${h_2}$ is respectively ${t_1}$ and ${t_2}$ then the ratio of ${t_1}$ to ${t_2}$ 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 $……m$ : $\left( g =10\, m / s ^{2}\right)$