Question

Alfredo is trying to measure the speed that cars travel down the street outside of his house. Outside his house there is a stoplight, and then another stoplight about ½ mile down the road. Alfredo says, "I can use my watch with a second hand to time the cars from when they leave the first light and stop at the next light. To find the speed I can just take the ½ mile distance and divide by the time." What are two flaws with Alfredo's plan which will not allow him to see how many cars are speeding on his street? Also explain how you would revise the experiment to avoid these problems

Answer 1

Answer:

drastic assumption that the car moves along the path at the same speed,

hese failures, it would be necessary to take the time of each type of trajectory, accelerated, constant and decelerated, this method is not easy since it implies knowing the distance in each type of movement,

Explanation:

In this exercise Alfredo makes a drastic assumption that the car moves along the path at the same speed, in reality the car when leaving the first traffic light accelerates until it reaches a speed, then remains constant and decelerates to be able to stop at the second traffic light.

To overcome these failures, it would be necessary to take the time of each type of trajectory, accelerated, constant and decelerated, this method is not easy since it implies knowing the distance in each type of movement, another method would be that the two traffic lights were in green so that the vehicle can run with constant speed throughout the trajectory