ok i got back my test today and its some basic stuff, but i don't get the difference between AVG speed and AVG velocity.(adsbygoogle = window.adsbygoogle || []).push({});

One of my problems was 'The length of the barrel of a blowgun is 1.2 meters. Upon leaving the barrel, a dart has a speed of 14 m/s. Assmuing that the dart was uniformly accelerated, how long does it take for the dart to travel the length of the barrel?' and for the answer I got .086s but the correct answer was .17 s

Can anyone explain to me how the teacher got this?

because all i did was 1.2/14 but to me it seems my teacher did 1.2/7 but why?

And for the second part 'A skate boarder accerates from rest to 26 m/s in 10 seconds. His avg speed over this time interval is ?.

The answer is 13 m/s but i have not a clue how he got this

Can someone explain to me?

Thanks in advance

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# Homework Help: Concept of avg speed

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