Recent content by Purity

Got it, thanks :) I've never heard of a head to tail method before but thank you! the book never mentioned it.

I still don't understand, what I've got drawn is the vertical North axis and line for the boat coming off at 120 degrees and then another line for the current coming off at 225 degrees but they share the same vertex. have i drawn it wrong?

Homework Statement A boat is sailing on a bearing of 120° and has a speed of 4ms^-1 relative to water. A current has a speed of 2ms^-1 and flows south west. Find the resultant speed of the boat 2. The attempt at a solution I've been stuck on this question for an hour now and can't...

Shouldn't stumble into this problem again :D Thank you!

Oh i see :) I got confused because when i did pure I was taught that you couldn't divide matrices (i was looking at r=(v^2-u^2)/2a) and i was working all these out in matrix form (as a column vector) and it didn't occur to me to dividing it through because i was deliberately avoiding that. I...

I only said t=10 because that was the only time value in the question and i couldn't use acceleration from my previous answer because I'm using a different velocity value now. I'm so confused...

Homework Statement "A particle moves in the horizontal plane that contains the perpendicular unit vectors i and j. Initially it is at the origin and has velocity 18ims^-1. After accelerating for 10 seconds its velocity is (30i + 8j)ms^-1. Assume that the acceleration of the particle is...