if a runner is moving with a speed of 1.5m/s and changes her speed to 2.1m/s over time period is 3s, what is her average speed?
To find the average speed, we need to calculate the total distance traveled and divide it by the total time taken.
Given that the initial speed is 1.5 m/s and the final speed is 2.1 m/s, we can use the average speed formula:
Average Speed = Total Distance / Total Time
To find the total distance traveled, we can use the formula:
Total Distance = Average Speed × Total Time
Since the runner's speed is changing over time, we can assume that her speed is changing uniformly. In that case, the average speed can be considered as the velocity at the halfway point. Therefore, her average speed would be the average of her initial and final speeds.
Average Speed = (1.5 m/s + 2.1 m/s) / 2 = 1.8 m/s
Therefore, the runner's average speed is 1.8 m/s.