A speedometer typically has a threshold of about 15 km/hr. If the car starts from rest and accelerates, the speedometer will :

Start reading from the moment the car starts

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Start reading when the speed reaches 15 km/hr

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Start reading when the speed reaches 30 km/hr

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None of these

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Solution

The correct option is A Start reading when the speed reaches 15 km/hr
Threshold of the speedometer represents the minimum speed of the vehicle by which it must be moving to display the instantaneous speed of the vehicle. Thus, $15 k m / h r$ threshold of the speedometer means that it starts reading the speed of the vehicle once the speed reaches $15 k m / h r .$

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