Final answer:
Emerson would take 10 seconds to run 40 meters at a speed of 4 m/s, as time is calculated by dividing distance by speed.
Step-by-step explanation:
To find out how long it takes Emerson to run 40 meters at a speed of 4 meters per second (m/s), we use the formula for time, which is Time = Distance / Speed. In this case, the distance is 40 meters and the speed is 4 m/s.
To calculate the time taken, divide the distance by the speed:
Time = 40 meters / 4 m/s
Time = 10 seconds
Therefore, it would take Emerson 10 seconds to run down the soccer field for 40 meters.