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

$\\ \bull\tt\dashrightarrow Velocity\times Time$

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

Displacement at next 5s

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

Now

Total displacement=50-40=10m