I got a couple of questions about vectors homework.. I wasn't in class to do it so I'm quite confused to say the least
1) A ferry crosses a river that is flowing at 5ms. If the ferry is travelling at 12ms, calculate its resultant velocity.
I got 13ms, but I'm unsure what I was meant to do so I just played about with the numbers
2) A footballer runs around a football pitch as part of his training. He starts at the halfway line and runs around the pitch to point D (basically, he runs right round the pitch and stops at the corner before completing a full lap, if that makes any sense). This run takes him 50 seconds.
a) Calculate the total distances travelled by the footballer (basically runs 50m to one corner from halfway, then 70m upwards to the next corner, 100m across the pitch to next corner then down 70m to point D at next corner) - I basically added them up and got 290m.
b) What is his final displacement at point D - I just put 50m, as I'm not sure what that means but I thought it meant how much did he still have to complete? I may be completely wrong
c) This is the part I'm stuck on. Calculate the footballer's average velocity for the run. I have absolutely no clue what to do or where to start
So any help would be appreciated
c) Calculate the footballer's average velocity for the run.