What factors does the speed of atoms depend on?

The speed of atoms depends upon:

Temperature: Speed of atom is directly proportional to the temperature of atoms.Pressure : It is also directly proportional to the speed of an atom.Volume of gas : As the volume of gas increases, collision between atoms increases with increasing the speed of atomNumber of atoms surrounding: More number of atoms leads to more collisions, increasing speed of atoms.

45 is the correct answer

Since you have not included the experiment situation and the data, of course, i can not give you specific details about it. but i can you with this question.1) i will assume that the motion is projectile (parabolic) motion.2) yes, the horizontal distance depends on the horizontal velocity as, naming vx the horizontal velocity and t the time, it is: x = vx × t3) now, observe that the flight time depends on the vertical velocity as, naming voy the initial vertical velocity, t the time and y the vertical distance before reaching the ground: y = yo + voy×t - gt² / 2.the higher the initial vertical velocity (voy) the longer the object will be flying and so t will be higher in the equation for the horizontal distance.that explains the relationship between the horizontal distance and the horizontal velocity.