Question

(OUR

,
5. George walks to a friend's house. He walks 750 meters North, then realizes he walked too far. He
turns around and walks 250 meters South. The entire walk takes him 13 seconds. What is his speed
per second?
780m od North
you wild
) 250ml south
135 t
ooo m/135
76.923 m/s
6. In problem #5, what was George's velocity in meters per second? (hint: draw a picture to find his
displacement)​

Answer 1

George's speed per second is 76.92 m/s

George's velocity in meters per second was 38.46 m/s (North)

Step-by-step explanation:

When dividing the total distance covered by object by time, we get the value for average speed.

`\text { speed }=\frac{\text {distance}}{\text {time}}`

Given:

t = 13 seconds

Calculate the distance without consideration of motion’s direction. So, the distance walks 750 m north first, and then turn around walks 250 m south, so the total distance covered is

d = 750 + 250 = 1000 meters

To find the rate per second, simply divide the distance by the time.

`\text { speed }=(1000)/(13)=76.92 \mathrm{m} / \mathrm{s}`

In given case, the students walks 750 m north first, and then turn around walk 250 m south. The displacement is the distance in a straight line between the initial and final position: therefore, in this case, the displacement is

d = 750 (north) - 250 (south) = 500 m (north)

The time taken is t = 13 s

So, the average velocity is
`\text {velocity}=(500)/(13)=38.46 \mathrm{m} / \mathrm{s}` (North)

And the direction is north (the same as the displacement).