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t1= 2s
t2=4s
ditanya Δr
============
r1 = ( 2.2 + 2 )i + ( 4.2 )j
= 6i + 8j
r2= ( 2.4 + 2 )i + ( 4.4 )j
= 10i + 16j
Δr = ( x2 - x1 )i + ( y2 - y1 )j
= ( 10 - 6 ) + ( 16 - 8 )
= 4 + 8
= 12 m