To determine which unit abbreviation is a measurement of force, let's analyze each of the given options:
A. \( m/s \) (meters per second):
- This unit measures velocity, describing how fast an object is moving in a given direction.
B. \( m/s^2 \) (meters per second squared):
- This unit measures acceleration, describing how quickly the velocity of an object is changing over time.
C. N (Newton):
- This unit measures force. In the International System of Units (SI), a Newton is defined as the amount of force required to accelerate a mass of one kilogram by one meter per second squared. It combines mass (kilograms), distance (meters), and time (seconds) in this way: \( N = kg \cdot m/s^2 \).
D. N/B:
- This does not represent a standard unit of force in physics or any related field.
Based on the analysis above, the correct unit that measures force is \( \text{N} \) (Newton).
Therefore, the correct answer is:
C. N
