Question

select all that apply
which units would be acceptable units of speed?

meters per mile
miles per hour
centimeters per day
inches per decade
days per year
meters per second per second

Explanation:

Speed is defined as distance traveled per unit of time, so valid units must have a distance unit divided by a time unit.

• Meters per mile: two distance units, not speed.
• Miles per hour: distance (miles) / time (hour), valid speed unit.
• Centimeters per day: distance (centimeters) / time (day), valid speed unit.
• Inches per decade: distance (inches) / time (decade), valid speed unit.
• Days per year: time / time, not speed.
• Meters per second per second: distance / time², this is acceleration, not speed.

Answer:

B. Miles per hour
C. Centimeters per day
D. Inches per decade