What was the average velocity and speed of the car?

[wogdogg]

Hi, i have a few questions about motion. any help would be much appreciated.

Q1. If a car was driven 250km from home to town, and back again in 12 hours:
a) what was the average velocity?
b) what was the average speed?
c) what was the average speed in m/s?
(show working out)

thats it for now...thanks to any helpers, incase i don't reply.

 

[ek]

Do you know the difference between speed and velocity?

Because that concept is pretty germane to these questions.

 

[recon]

Hints:
a) There is no overall displacement.
b) The total distance traversed is 250 km x 2 = 500 km
c) 1 km = 1000 m. 1 hour = 3600 seconds. For example, if you want to convert 100 km/h to m/s, you would proceed as follows:

100 km = 100,000m
1 hour = 3600 seconds. So,
100 km/h = 100,000m/3600 s = 27.78 m/s

 

[Leaping antalope]

a) average velocity=total displacement/time
b) average speed=total distance/time
c) 1km=1000m, 1h=3600s
1km/h=1000/3600 m/s

I thinks these hints are pretty straight forward...try it yourself...