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Apps About code given below

<string-array name="collisions">
<item>hdr Collisions</item>
<item>img dynamics_collisions</item>
<item>sub Elastic Collisions</item>
<item>Relative speed of approach of the bodies equals relative speed of separation:</item>
<item>for u{s}1{/s} - u{s}2{/s}=v{s}1{/s} + v{s}2{/s}</item>
<item>cap Both momentum and kinetic energy are conserved in elastic collisions.</item>
I want to know that what are hdr,img,sub and cap in above code? Is it class name of those items and if yes how we specify styles for those classes?
 
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