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r1 = x i + y j = 2 i + 4 j
b. Persamaan posisi r2 (10,16).
r2 = x i + y j = 10i + 16 j
c. Persamaan perpindahan Δr
Δr = r2 – r1 = (10i + 16 j) – (2 i + 4 j)
Δr = 10i +1 6 j – 2 i – 4 j = 8 i + 12 j
vr= Δr/Δt
=8i+12j/4-0
=8i+12j/4
=2i+3j