Final answer:
Speed is the measure of how quickly an object is moving, and a higher speed is more desirable when running a race. Grade % refers to the steepness of a road or hill, and its effect on speed depends on whether it is uphill or downhill. Therefore, the effect of grade % on speed in a race would depend on whether it is positive or negative.
Step-by-step explanation:
Speed is the measure of how quickly an object is moving, typically expressed in terms of distance covered per unit of time. In the context of a race, a higher speed indicates a faster run. Therefore, it is more desirable to have a speed with a high percentile when running a race.
Grade % is a measure of the steepness or slope of a road or hill. In the context of running a race, grade % could refer to the incline or decline of the running surface. The impact of grade % on speed would depend on the direction of the grade. If the grade is uphill, it would generally result in a slower speed. On the other hand, if the grade is downhill, it could potentially increase the speed. Therefore, the effect of grade % on speed in a race would depend on whether it is positive or negative.