
Concept explainers
To end up with units of speed, you need to
a. multiply a distance by a time.
b. divide a distance by a time.
c. divide a time by a distance.

The method to arrive at the units of speed.
Answer to Problem 1QQ
Solution:
(b) divide distance by time.
Introduction:
Units of a physical quantity give an indication of the type of the physical quantity which is being measured. When two physical quantities are multiplied or divided, the units of the resulting physical quantity will be a product or the quotient of the units of the individual physical quantities, as the case may be.
Explanation of Solution
Speed is defined as the distance travelled in unit time. Hence, the units of speed is obtained by dividing the units of distance by the unit of time.
Conclusion:
The units of speed are obtained by dividing a distance by a time. The correct option is (b)
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