The centre of mass of a body may be defined as the point at which the whole mass of the body may be assumed to be concentrated.
The centre of gravity of a body is a point at which the resultant of all the parallel forces due to gravity experienced by various particles of the body acts or at which whole weight of the body acts.
If the moon is revolving with speed v in a circular orbit of radius r, then acceleration acting on it along the radius and towards the centre of its orbit is
$\mathrm{ac}=\frac{{\mathrm{v}}^{2}}{\mathrm{r}}$Equations of Motion for Freely Falling Bodies:
General equations of motion  Equations of motion for freely falling bodies


1. v = u + at  $\to $  v = u + gt 
2.
$\mathrm{s}=\mathrm{ut}+\frac{1}{2}{\mathrm{at}}^{2}$

$\to $  $\mathrm{h}=\mathrm{ut}+\frac{1}{2}{\mathrm{gt}}^{2}$ 
3. ${\mathrm{v}}^{2}={\mathrm{u}}^{2}+2\mathrm{as}$  $\to $  ${\mathrm{v}}^{2}={\mathrm{u}}^{2}+2\mathrm{gh}$ 
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