The initial angle’s complementary values result in the same range but the heights are different. 45o is the projection angle with the maximum range.
For this experiment, the velocity is still constant in the x-direction (vox = vx = constant). The only difference is that the velocity has a y-component (vo = (vox2 + voy2)½ ). For both experiments, the initial velocity is the same (vox = vo cos q and voy = vo sin q). To find the motion’s equation, Δy = v0y t + ½ a t2, t was solved:
There is a significant difference between the theoretical range and the experimental range. Errors could have occurred due to incorrect readings because of parallax and calculation errors because of rounding off.
These experiments, despite having quite evident errors, the angles with the highest range are 400 and 450. The experiment further emphasized the independence of x- and y-components in projectile motion (Serway, Vuille & Faughn,