Neglecting air resistance, all objects fall to earth at a constant acceleration of 9.80 m/s². This value is known as the gravitational acceleration, g, and it is equal to 32.2 ft/s² in the English system of units. The distance, d, traveled by the object and the time, t, it takes for the object to fall is given by .

d = 1/2at²

t =√2d/g

Explanation:

From the equation of motion; we have s = ut + 1/2 at², when a body continue to move or set at motion the initial velocity of that body becomes 0=u, there by, the resulting equation becomes;

S = ut + 1/2 at² when u= 0

S = 0×t + 1/2 at²

S = 0 + 1/2at²

S = 1/2at² , here s = d, a = g

d = 1/2gt².

The time taken is;

t = √2d/g where d is the distance travelled in one second, g is the acceleration due to gravity.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.