All matter is made up of tiny particles called . Atoms are made up of three subatomic particles known as , , and . Protons and neutrons are located in the . The nucleus is dense and takes up very little space within the atom. All protons have a charge (p+) and have a mass of about 1 amu. All neutrons have no charge or are (no) and have a mass of about 1 amu.
Electrons are located in the area known as the electron cloud. Electrons orbit around the nucleus and have a charge (e-).

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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.