First slide
Average Velocity

A particle is moving such that its position coordinates (x,y) are (2m, 3m) at time t = 2s and (13 m, 14m) at time t = 5s

Average velocity vector vav from t = 0 to t = 5 s is 


At time t = 0, the position vector of the particle is r1=2i^+3j^

At time t = 5s, the position vector of the particle is r2=13i^+14j^

Displacement from r1 to r2 isΔr=r2r1=(13i^+14j^)(2i^+3j^)=113i^+11j^

Average velocity, 


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