An enzyme is discovered that catalyzes the chemical reaction SAD ↔ HAPPY A team of motivated researchers sets out to study the enzyme, which they call happyase. They find that the kcat for happyase is 600 s-1. They carry out several experiments and found that, when [Et] = 20 nM and [SAD] = 40 μM, the reaction velocity, V0, is 9.6 μM s-1. The Km for the substrate SAD is μM .