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=2x1²-3x1-5
=2-3-5
=-6
Xakhir=2t²-3t-5
=2x2²-3x2-5
=8-6-5
=-3
Δv=Δr/Δt=Xakhir-Xawal/Takhir-Tawal=-3-(-6)/2-1=3/1=3
b.X=2t²-3t-5
V=4t-3
V=4x3-3
V=12-3
V=9