A ball is projected from ground with a velocity v at an angle ๐œƒ to the vertical . On its path it makes an elastic collision with a vertical wall and returns to ground . The total time of flight of the ball is 2๐‘ฃ๐‘ ๐‘–๐‘›๐œƒ" " /๐‘” 2๐‘ฃ๐‘๐‘œ๐‘ ๐œƒ" " /๐‘” 2๐‘ฃ๐‘ ๐‘–๐‘›2๐œƒ" " /๐‘” 2๐‘ฃ๐‘๐‘œ๐‘ ๐œƒ" " /๐‘”

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