Question

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?
O
O
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

Answer 1

A. 20 m/s north

Step-by-step explanation:

The velocity of the car can be calculated as:

`v=(d)/(t)`

where

d is the displacement

t is the time interval

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

`r_i = -50 m` (south)

while the final position is

`r_f = +250 m` (north)

So, the displacement is

`d=r_f -r_i = +250-(-50)=+300 m` (north)

The time interval for the motion is

t = 15 s

So, the velocity of the car is

`v=(+300)/(15)=+20 m/s` (north)