Question

An elevator travels at an average velocity of +5 m/s for 10 seconds and then -8 m/s for 5 seconds. Determine the elevator's displacement.

Answer 1

Displacement at 10s

`\\ \bull\tt\dashrightarrow Velocity* Time`

`\\ \bull\tt\dashrightarrow 5(10)=50m`

Displacement at next 5s

`\\ \bull\tt\dashrightarrow -8(5)=-40m`

Now

Total displacement=50-40=10m