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Simple average speed/average velocity problem

  • #1

Homework Statement


Jeremy is training for a boxing match. He runs due north at an average speed of 16km/h for the first 8.0 km and returns to the training camp at an average speed of 10 km/h. Calculate his average speed and his velocity.


Homework Equations


Vavg = Total Distance / Total Time
Average Velocity = Final displacement / Total time taken


The Attempt at a Solution


16 km/h for first 8.0 km = 0.5 hours
10 km/h for the trip back = 0.8 hours
Total time taken = 1.3 hours
Total distance = 16 km

Average speed = 16/1.3
=12.3 km/h.

The answer on my sheet is 12km/h. Am I doing something wrong or is it just rounded?
For average velocity, would it be 0? Since there is no displacement from the starting point?

I am just starting physics, and I just need guidance in the right direction.

Thank you.
 

Answers and Replies

  • #2
Delphi51
Homework Helper
3,407
10
Your calcs look good. Yes, the answer should be rounded to 2 digits since all the given quantities are accurate to 2 digits.
 
  • #3
Alright, thank you!
Sorry if this seems like a silly question, I just want to make sure my work is correct before going forward.
 

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