Physics
Assertion (A) : The unit used to measure speed is an example of a derived unit.
Reason (R) : Derived units can neither be changed nor can be related to any other fundamental unit.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Measurements
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Answer
assertion is true but reason is false
Explanation
Assertion (A) is true as so its unit is metre/second (m/s), which is a derived unit because it is formed from the fundamental units of length (metre) and time (second).
Reason (R) is false because derived units are defined in terms of fundamental units. For example, speed is m/s, force is kg·m/s², etc. so derived units are completely related to fundamental units.
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