A person is walking briskly in a straight line. The figure shows a graph of the person’s position as a function of time . What is the person’s average velocity between t = 6 s and t = 10 s?

A person is walking briskly in a straight line The figure shows a graph of the persons position as a function of time What is the persons average velocity betwe class=

Respuesta :

We are given graph of position of a person

For finding velocity , we will have to find slope of the given curve

Since, we have to find average velocity between t=6s to t=10s

We can see that there are shape of curve between t=6 and t=10

t=6 to t=8:

There is a inclined line

we can select any two points on that line and find slope

(5,1) and (8,6)

now, we can find slope using formula

[tex] m=\frac{y_2-y_1}{x_2-x_1} [/tex]

now, we can plug values

[tex] m=\frac{6-1}{8-5} [/tex]

[tex] m=\frac{5}{3} [/tex]

so, first velocity is

[tex] v_1=\frac{5}{3} m/s [/tex]

t=8 to 10:

We can see that there is horizontal line

so, we can select any two points

(8,6) and (10,6)

now, we can find slope using formula

[tex] m=\frac{y_2-y_1}{x_2-x_1} [/tex]

now, we can plug values

[tex] m=\frac{6-6}{10-8} [/tex]

[tex] m=0 [/tex]

so,

[tex] v_2=0m/s [/tex]

Average velocity between t=6 and t=10:

now, we can find average velocity

[tex] v=\frac{v_1+v_2}{2} [/tex]

[tex] v=\frac{\frac{5}{3}+0}{2} [/tex]

[tex] v=0.8 [/tex]

so,

average velocity is 0.8m/s...........Answer