The average speed of the object is given by the ratio between the total distance covered and the total time needed for the motion:
[tex]v= \frac{S}{t} [/tex]
The total distance covered is:
[tex]S=2m + 80 m = 82 m[/tex]
while the total time of the motion is
[tex]t=2s+40 s=42 s[/tex]
Therefore, the average speed of the object is
[tex]v= \frac{S}{t}= \frac{82 m}{42 m}=1.95 m/s [/tex]
