EVERYDAY SCIENCE

Detailed explanation-1: -Assertion :The speedometer of an automobile measures the instantaneous speed of the automobile. Reason: Average velocity is equal to total displacement divided by total time taken.

Detailed explanation-2: -speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.

Detailed explanation-3: -Instantaneous speed is the speed of an object at a particular moment in time. Instantaneous speed is measured in metres per second m s − 1 . The instantaneous speed of an object can be calculated if we know the distance travelled in a very short period of time.

Detailed explanation-4: -If a car travels around a gentle curve on a highway at 60km/h the velocity does not change. A car’s speedometer shows instantaneous speed because the speedometer shows the cars speed while the car is moving at that moment.