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A ball is projected from ground with a velocity V at an angle theta to the vertical. On its path it makes an elastic Collison with a vertical wall and returns to ground. The total time of flight of the ball is

  1. fraction numerator 2 v s i n invisible function application theta over denominator g end fraction    
  2. fraction numerator 2 v c o s invisible function application theta over denominator g end fraction    
  3. fraction numerator v s i n invisible function application 2 theta over denominator g end fraction    
  4. fraction numerator v c o s invisible function application theta over denominator g end fraction    

The correct answer is: fraction numerator 2 v c o s invisible function application theta over denominator g end fraction

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