The diagram shows components that have been added together to form Rx and Ry. Rx and Ry are the components of the resultant vector. Three vectors drawn on the x y plane. The first vector is drawn in the positive x direction along the x axis and labeled R Subscript x Baseline. The second is drawn tail to tip method north and labeled R Subscript y Baseline. The last is drawn from the tail of the first to the head of the second and labeled R. The angle between R and R Subscript x Baseline is labeled theta.

Which formula can be used to find the angle of the resultant vector?

If an object is moving or in motion

That would be kinetic energy

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.