A motorist drives north for `35.0`minutes at `85km//h` and then stops for 15 minutes. He next continues north , travelling 130km in `2.00hours`.
What is his total displacement?
what is his average velocity?

Explanation

`V_(1)=85kmph,t=35.0min,S_(2)=130km`.
`S_(1)="displacement"=(85)/(60)xx35=43.58km`
`S_(2) =130km`
`s=s_(1)+s_(2)=49.58+130=179.58km`
avetage velocity `V_(ave)=(s_(1)+s_(2)+s_(3))/(t_(1)+t_(2)+t_(3)`
`=(49.58+0+130)/((35)/(60)+(15)/(60)+2)`
`=(179.58xx60)/(170)=(10774.8)/(170)`
`=63.38=63.4 km//hour`