define in detail:a) average speed b) average velocity
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The SI unit for velocity is m/s. Velocityis a vector and thus has a direction. ...Instantaneous speed is the magnitude of the instantaneous velocity.Instantaneous speed is a scalar quantity, as it has no direction specified. Average speed is the total distance traveled divided by the elapsed time.
Average velocity is the ratio of total displacement to total time. Its direction is same as the direction of the moving object. Even if the object is slowing down, and the magnitude of the velocity is decreasing, its direction would be still the same as the direction in which the object is moving. The magnitude of average velocity is always less than or equal to the average speed because displacement is always smaller than or equal to distance.
The total distance travelled by the body in total time is the average speed.
Average speed = TotalDistanceTotalTime
It is a scalar quantity and its units are m/s.
Calculating Average Speed
Average speed is found by the first finding the total distance covered by the object and dividing it by the total time taken in traveling the distance. Example: A body covers a circle of radius 100m on 100s, implies the total distance covered by him will be d = 2πr = 200π m. So, the average speed will be v= dt = 2π m/s
Average velocity is the ratio of total displacement to total time. Its direction is same as the direction of the moving object. Even if the object is slowing down, and the magnitude of the velocity is decreasing, its direction would be still the same as the direction in which the object is moving. The magnitude of average velocity is always less than or equal to the average speed because displacement is always smaller than or equal to distance.
The total distance travelled by the body in total time is the average speed.
Average speed = TotalDistanceTotalTime
It is a scalar quantity and its units are m/s.
Calculating Average Speed
Average speed is found by the first finding the total distance covered by the object and dividing it by the total time taken in traveling the distance. Example: A body covers a circle of radius 100m on 100s, implies the total distance covered by him will be d = 2πr = 200π m. So, the average speed will be v= dt = 2π m/s
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Average speed is a rate. In kinematics, a rate is always a quantity divided by the time taken to get that quantity (the elapsed time). Since average speed is the rate position changes, average speed = distance traveled/time taken.
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