deletions | additions       diff --git a/According_to_citet_To_2013_the__.tex b/According_to_citet_To_2013_the__.tex  index a297685..684229c 100644  --- a/According_to_citet_To_2013_the__.tex  +++ b/According_to_citet_To_2013_the__.tex 
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According to \citet{To_2013}, the Information technology has the means to use and integrate their knowledge and developments to create a resource-efficient and environmentally sound solutions for the issues that the society is facing today. IT can also support environmental initiatives and create green awareness. The Internet is being increasingly used as a medium for disseminating environmental awareness to children. For example, the National Institute of Environmental Health Sciences has a web page that hosts small on-line games designed to teach children about the environment. \cite{Zualkernan_2009} But, according to \citet{song2012analysis}, from his study, there are many research focused on environmental protection and pollution control, but the study of water pollution is almost non-existent, especially government and corporate behaviors for water pollution control.  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. Initially, the garbage was from a single point location in the game with \begin{equation*}\vec{v}_{0}}  \begin{equation*}\vec{v}_{0}=(v_{0x},\ v_{0y}),\tag{1}\end{equation*}