Question 1 :
A ball of mass m is thrown vertically upward from the ground and reaches a height h before momentarily coming to rest.If g is acceleration due to gravity,the impulse received by the ball due to gravity force during its flight is

Question 2 :
Two planets of radii $r_1$ and $r_2$ are made from the same material.The ratio of the acceleration of gravity $\dfrac{g_1}{g_2}$at the surface of the two planets is-

Question 3 :
A body weight $72\ N$ on the surface of the earth. What is the gravitational force acting on it due to the earth at a height equal to half the radius of the earth from the surface?

Question 4 :
If rope of lift breaks suddenly, the tension exerted by the surface of lift (a=acceleration of lift)

Question 6 :
<span>The total mechanical energy E possessed by a body of mass 'm', &#160;moving with a velocity 'v' at a height 'h' is given by : $E\, =\, \displaystyle \frac{1}{2}\, mv^{2}\, +\, mgh.$&#160;</span>Make 'm' the subject of formula.

Question 7 :
A particle is dropped under gravity from rest from a height $h (g = 9.8 \,m/s^2)$ and it travels a distance $\dfrac{9h}{25}$ in the last second the height '$h$' is:

Question 8 :
What is the acceleration of a body when it is projected vertically upwards?<br>

Question 9 :
The acceleration due to gravity $g$ and density of the earth $p$ are related by which of the following relations? (Here $G$ is the gravitational constant and $R$ is the radius of the earth).

Question 10 :
If ${M}_{E}$ is the mass of the earth and ${R}_{E}$ its radius, the ratio of the acceleration due to gravity and the gravitational constant is:

Question 11 :
A planet has mass and radius&#160; both half of earth. Acceleration due to gravity (g) at its surface should be&#160;<br/>&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160;&#160;

Question 12 :
A student determined to test the law of gravity for himself walks off a skyscraper $320m$ high with a stopwatch in hand and starts his free fall (zero initial velocity). $5$ seconds later, superman arrives at the scene and dives off the roof to save the student. what must be superman's initial velocity in order that he catches the student just before reaching the ground? [assume that superman's acceleration is that of a free-falling body, $g = 10m/s^2$]

Question 13 :
The diameters of two plantes are in the ration 4:1 and their density in the ration 1:2 The acceleration due to gravity on the planets will be in ratio,

Question 14 :
Two projectiles, one fired from the surface of the earth with speed $5\ { m }/{ s }$ and the other fired from the surface of a planet with initial speed $3\ m/s$,&nbsp;trace identical trajectories. Neglecting friction effect the value of acceleration due to gravity on the planet is:

Question 15 :
Let $V$ and $E$ denote the gravitational potential and gravitational field at a point. It is possible to have

Question 16 :
If the earth's radius were to shrinks by $1\%$ and its mass remained the same then the acceleration due to gravity on its surface would

Question 17 :
Two planets of radii $r_{1}$ and&#160;$r_{2}$ are made from the same material. The ratio of the acceleration due to gravity&#160;$g_{1}/g_{2}$ at the surfaces of the two planets is:

Question 18 :
If the mass of the earth increases by $80\%$ and radius of the earth increases by $40\%$ then the percentage charge in acceleration due to gravity on the surface of radius of earth is (where $g_{s}=\dfrac{GM} {R^{2}} ,M=$ mass of earth and $R=$ radius of earth})

Question 19 :
Earth is flattened at the poles and bulges at the equator. This is due to the fact that

Question 20 :
If the mass of earth is $80\ times$ of that of a planet and diameter is double that of planet and $'g'$ on the earth is $9.8\ ms^{-2}$, then the value of $'g'$ on the planet is =_____ $ms^{-2}$&nbsp;