Please do an IRAC for this

Question 16 15 pt Karl v. Vanessa On November 1, 2019, Karl opened a sandwich shop in Northridge across the street from a sandwich shop run by Vanessa. Vanessa's sandwich shop had been in business for 10 years and had made between $5,000 -$10,000 per year in bad times, and $100,000 - $200,000 profit per year in good times. Disturbed by this new competition, Vanessa entered into a written agreement to pay Karl the sum of $50,000, in exchange for Karl's promise to quit his business and not to open any kind of restaurant whatsoever anywhere in the State of California for 5 years, beginning January 1, 2020. QUESTION: Is this contract legal and enforceable? Explain why or why not in detail