1. The problem statement, all variables and given/known data X-axis t1= 3 min t2= 2 min (Since it's west, it is -2) t3= 1 min (Since it's northwest, it is -1) Y-axis V1y= 20 m/s (Since it's south, it is -20) V2y= 25 m/s (It's -25) V3y= 30 m/s (Stays positive since it's in the northwest) 2. Relevant equations A) Total Vector Displacement Δr= (t3-t2-t1) i + (V3-V2-V1) j B) Average Speed Not really sure, I guess it is Average Speed = Distance/TotalTime C) Average Velocity Vav = Displacement/ΔTime 3. The attempt at a solution A) Total Vector Displacement Δr= (-1 i + 30 j) - (-2 i + -25 j) - (3 i + -20 j) Δrx= ((-1)-(-2)-3) i = -2 i Δry= ((30)-(-25)-(-20)) j = 75 j Δr= -2 i + 75 j B) Average Speed Total time is 6 minutes = 360 seconds but I don't know should I use the velocity as a distance or I need to calculate it too? C) Average Velocity To calculate the displacement, I take the square root of x^2 + y^2 Displacement = Square root of (-2)^2 + (75)^2 = 75.03 Δt, -2 minutes = -120 seconds My instructor said time should be positive, but I don't know if Δtime should be positive too or it's okay to be negative. Vav= 75.03/-120 = -0.63 m/s I hope anyone could tell me if what I did is right and what I need to do in order to calculate the average speed.