900 mph................
Answer:
a = 0.8 m/s/s
Vav = 45m/s
Explanation:
Vav = [tex]\frac{Vi + Vf}{2\\}[/tex]
Vav = [tex]\frac{10 +80}{2}[/tex]
a = [tex]\frac{v}{t}[/tex]
a = [tex]\frac{4m/s}{5s}[/tex]
a= 0.8m/s/s
