x(t)=x(8)= "8^{3}-3\\sdot8^{2}-45\\sdot8=-40" m
v(t)=x'(t)="3t^{2}-6t-45"
v(8)="3\\sdot8^2-6\\sdot8-45=99" m/s
a(t)=v'(t)=6t-6
a(8)="6\\sdot8-6=42" "m\/s^{2}"
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