1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Relative Velocity Expression

  1. Sep 28, 2010 #1
    Ship A is located 3.3 km north and 2.7 km east of ship B. Ship A has a velocity of 22 km/h toward the south and ship B has a velocity of 40 km/h in a direction 37° north of east.

    (a) What is the velocity of A relative to B?

    (b) Write an expression for the position of A relative to B as a function of t, where t = 0 when the ships are in the positions described as above.

    (c) At what time is the separation between the ships least?

    (d) What is that least separation?

    2. Relevant equations: Vaw = Vab + Vbw

    3. Okay, so I got the answer for part a, which is -31.95i - 46.07j, but I'm completely lost on the rest of the parts. I have no idea on how to express b in terms of i and j, let alone solve for it, any ideas?
  2. jcsd
  3. Sep 28, 2010 #2
    Okay, so I figured out part b, but how can I go about doing part c?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook