Question

During a physics experiment, a student determines that the unit rate for a marble’s motion is 2 centimeters per second. What is the unit rate describing the number of seconds it takes the marble to travel one centimeter? A. B. C. D.

Answer 1

To find the unit rate describing the number of seconds it takes the marble to travel one centimeter, we need to invert the given unit rate of 2 centimeters per second.

This can be done by taking the reciprocal (or multiplicative inverse) of the given unit rate:

1 / 2 cm/s

This means that the marble travels 1 centimeter in 1 / 2 second, or

2 seconds per centimeter

Therefore, the unit rate describing the number of seconds it takes the marble to travel one centimeter is 2 seconds per centimeter.

The answer is option D.