Question 10: Speedometer and Average Velocity Definition – Rankers Physics
Topic: Kinematics
Subtopic: Average Speed and Velocity

Question 10: Speedometer and Average Velocity Definition

Assertion (A): The speedometer of an automobile measures the average speed of the automobile.
Reason (R): Average velocity is equal to total distance divided by total time taken.
 
(1) Both (A) \& (R) are true and the (R) is the correct explanation of the (A)
(2) Both (A) \& (R) are true but the (R) is not the correct explanation of the (A)
(3) (A) is true but (R) is false
(4) Both (A) and (R) are false

Solution:

A speedometer measures instantaneous speed, not average speed. Average velocity is defined as total displacement divided by total time, while average speed is total distance divided by total time. Both assertion (A) and reason (R) are incorrect.

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