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A car moves from a position 50 m south of the library to a new position 250
m north of the library. This movement takes 15 seconds. What is the velocity
of the car?
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O
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A. 20 m/s north
B. 20 m/s south
C. 13 m/s south
D. 13 m/s north

Respuesta :

skyluke89

Answer:

A. 20 m/s north

Explanation:

The velocity of the car can be  calculated as:

[tex]v=\frac{d}{t}[/tex]

where

d is the displacement

t is the time interval

Taking north as positive direction, the initial position of the car is

[tex]r_i = -50 m[/tex] (south)

while the final position is

[tex]r_f = +250 m[/tex] (north)

So, the displacement is

[tex]d=r_f -r_i = +250-(-50)=+300 m[/tex] (north)

The time interval for the motion is

t = 15 s

So, the velocity of the car is

[tex]v=\frac{+300}{15}=+20 m/s[/tex] (north)

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