Was the Ripper motivated by sexual sadism? If not, what was the behavioral motive for the assault?

You have heard that there is a serial rapist in London who is known as the Ripper Copycat. You found out that a colleague of yours from London is on the investigation team for this serial rapist. Your colleague has e-mailed you and asked if you were familiar with Jack the Ripper if you have any information on the following:Was the Ripper motivated by sexual sadism? If not, what was the behavioral motive for the assault?Why was the Ripper targeting prostitutes?What were the Ripper’s signature behavior(s)?Why did the Ripper stop?