Final answer:
It takes 3 seconds for a rocket moving at a constant speed of 10 m/s to travel a distance of 30 meters.
Step-by-step explanation:
To determine how long it takes for a rocket traveling at a constant speed of 10 m/s to cover a distance of 30 m, we can use the basic equation of motion distance = speed × time. Rearranging the equation to solve for time gives us time = distance / speed.
Plugging in the given values, we get time = 30 m / 10 m/s = 3 seconds. Therefore, the correct answer is B. 3 seconds.