Cheryl runs a race 400.0 m circular track. she starts running east of the starting line and then circles the track and falls, stopping 1.00 m west of the starting line. her time is 80.0 s. what was her average velocity?

0.0125 m/s west

Explanation:

The velocity of an object is defined as the rate of change of the position of the object per unit time. In formulas:

where

d is the displacement (which is the diffence between the final and starting position of the object)

t is the time

In this problem, the displacement is just d=1.00 m (west), because this is just the difference between the final position (1.00 m west of the starting line) and the starting point). The time taken is t=80.0 s, so the average velocity is

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide