The initial velocity of Ms. Stafford is [tex]v_0 = 5 m/s[/tex], while her acceleration is
[tex]a=4 m/s^2[/tex]
This is a uniform accelerated motion, so we can calculate the total distance travelled by Ms. Stafford in a time of [tex]t=7.0 s[/tex] using the law of motion for a uniform accelerated motion:
[tex]S=v_0t + \frac{1}{2} at^2 = (5 m/s)(7.0 s)+ \frac{1}{2}(2 m/s^2)(7.0 s)^2 = 84 m [/tex]
