Which of these could not be a measurement of speed? a. 5 km/h b. 3 mm/s c. 2.5 days/mi d. 15,600 cm/min

C. 2.5 days/mi

Explanation:

Speed is defined as the distance covered by an object divided by the time taken to cover that distance:

where

S is the distance covered

t is the time taken

At the numerator of the fraction, we have distance, which is a lenght. Lenght is measured in different possible units: meters (m), kilometer (km), mile (mi), centimeter (cm)...

At the denominator, we have a time, which can be measured in seconds (s), minutes (min), hours (h), days..

According to this, we can see that option

C. 2.5 days/mi

cannot represent a speed. In fact, at the numeratore we have days (which is a measure of time), while at the denominator we have mile (which is a measure of length), so in this fraction distance and time are inverted, therefore this cannot be a measurement of a speed.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle