The temperature and brightness of stars are shown on the
bright-temp graph
h-r diagram
star model
luminosity grid

Therefore, The temperature and brightness of stars are shown on the H-R Diagram.

Explanation:

A star’s brightness, or luminosity, depends on the star’s surface  temperature and size.

If two stars have the same surface temperature, the larger star will be more luminous.

The Hertzsprung-Russell (H-R)  diagram below is a scatter plot that shows the relative  temperatures and luminosity of various stars.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

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.