The Answer;
In the name of Allah, Most Gracious, Most Merciful.
Vomiting food or water that is a mouthful or more, invalidates ones wudu. It is considered a mouthful when it cannot be prevented easily. This vomit is as impure as urine, so it is vital to protect the clothes and body from being stained by it. (Bahar-e-Shari’at, pp. 306, 390 etc, vol. 1)
And Allah(swt) alone knows best.