deletions | additions       diff --git a/According_to_citet_To_2013_the__.tex b/According_to_citet_To_2013_the__.tex  index cf2b761..162c207 100644  --- a/According_to_citet_To_2013_the__.tex  +++ b/According_to_citet_To_2013_the__.tex 
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Using the computer in education and recreation is common nowadays. In the study of \citet{Robic_2015}, it is noted that ICT can be great motivational tool for teaching and learning, especially computer games can be great motivational tool. Some games also include physics on it, namely Angry birds. The researchers would want to incorporate the physics projectile model because of the game concept that the researchers wants to design. Projectile motion is a case of motion which can be described as motion in two dimensions, in vertical and horizontal way. In the case of the game the air resistance can be neglected because the game was not designed to include air resistance in projectile motion. The projectile motion is then applied to the garbage in the game play. The following significant formula are the formulas that the researchers will be using in the game play,   \begin{equation*}y_{height}=(v_{0y}\sin\theta)t-\frac{1}{2}gt^{2}+y_{start},\tag{1}\end{equation*}where y start is the initial starting height from which the garbage will be thrown from the angle theta, and y height being the maximum height the garbage can reach in time t while g is the acceleration due to the gravity of the earth which is 9.8m/s squared and,  where v start is the initial velocity, sin theta as the component along the y-axis, and g being the acceleration due to gravity which is 9.8 m/s^2.