Question

A runner runs in a straight line with the average velocity of 5i-hat m/s for 5 minutes and then with an average velocity of 4i-hat m/s 4 minutes. a) what is her total displacement: b)What is her average velocity during this time c) suppose her goal is to run 5 km in 15 minutes. What average velocity must she have over the remaining portion of her run?

Answer 1

a)
5min*60s=300s 5m/s*300s=1500m
4min*60s=240s 4m/s*240s=960m
1500+960=2460 i-hatm

Answer 2

what do I do for b?

Answer 3

so displacement over what?

Answer 4

so took her 9 min to run 2460.

6 minutes and 2.54km to go

Answer 5

what is her displacement?

Answer 6

@satellite73 @Hero