isf vmax for a reaction is 7.5 micromolar *s-1 and the reaction velocity is 5 micoromolar when the substrate concentration is 1 micromolar, is 0.5 km.
Given that
Vmax = 7.5 μM/sec
V = 5 μM/sec
V = Vmax[s]/km + [s]
km + [s] = Vmax[s]/v
km=1.5mm - 1mm
km = 0.5mm
Velocity, as opposed to speed, refers to the pace and direction of an object's movement as it moves down a path. In other words, whereas velocity is a vector, speed is a scalar quantity. While speed and velocity both describe how quickly an object moves, they have different definitions of where the object is in space. A car on a highway, for instance, travels at 60 miles per hour. On a speedometer, the car's speed is displayed. It does not take into account the relative location of the vehicle; it only measures the amount of distance traveled over a given period of time. The speed at which an object travels a predetermined distance is known as speed.
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