Answer :
- Total displacement=150-65m=85m
- Time=5s
[tex]\\ \rm\longrightarrow Avg\:Velocity=\dfrac{Total\:Displacement}{Total\:Time}[/tex]
[tex]\\ \rm\longrightarrow Avg\:Velocity=\dfrac{85}{5}[/tex]
[tex]\\ \rm\longrightarrow Avg\:Velocity= 17m/s[/tex]