The purpose of the two studies presented in this paper is to establish validity evidence for the Sport Multidimensional Perfectionism Scale-2 (Sport-MPS-2: Gotwals & Dunn, 2009). Studies 1 and 2 are respectively focused on the production of structurally-related and external validity evidence.
The horizontal velocity of a projectile is constant (a never changing in value), There is a vertical acceleration caused by gravity; its value is 9.8 m/s/s, down, The vertical velocity of a projectile changes by 9.8 m/s each second, The horizontal motion of a projectile is independent of its vertical motion.
Consider now the case of an object that is projected at an angle to the horizontal other than 90 o. It is helpful to treat the horizontal and vertical components of velocity separately. A diagram of the motion is shown in Figure 1. Consider an object projected with velocity u at an angle A to the horizontal.If we ignore the effects of air resistance, the horizontal velocity is constant and the vertical velocity changes with a uniform acceleration.onsider now the case of an object that is projected at an angle to the horizontal other than 90 o. It is helpful to treat the horizontal and vertical components of velocity separately. A diagram of the motion is shown in Figure 1. Consider an object projected with velocity u at an angle A to the horizontal.