Question

fill in the blank question
when an object travels the same distance during each second, it travels with blank speed. if the blank changes during each second, it travels with changing speed.

Explanation:

1. For the first blank: When an object covers the same distance in each unit of time (here, each second), its speed is constant (or uniform). This is the definition of constant speed.
2. For the second blank: If the speed is changing, it means the distance traveled during each second (or unit time) is changing. So the quantity that changes is the "distance" (or more precisely, the "distance traveled" or "speed" itself, but in the context of the sentence structure, "distance" fits as the thing that changes per second to cause speed to change). But more accurately, when speed changes, the distance traveled per second changes, so the first blank is "constant" and the second blank is "distance" (or "speed" but "distance" is more in line with the sentence's wording as it's about distance per second).

Answer:

First blank: constant
Second blank: distance