You accidentally drop your ring into a graduated cylinder. the ring has a mass of 5 grams and the water level of the cylinder rises from 5ml to 7.5ml. what is the density of the ring?

Density is g/mL...
So just divide grams of ring by mL ring.
7.5 mL - 5 mL = 2.5 mL
5g / 2.5mL = 2 g/mL

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.