Physics · Grades 7–10
Displacement and average velocity
Use consistent SI units and keep the stated direction convention.
Rule and assumptions
Use consistent SI units and keep the stated direction convention.
v̄ = (x₂ − x₁)/Δt
Worked examples
On an east-positive axis, position changes from -38 m to -9 m in 5 s. Find the signed average velocity. Round to 3 decimal places if needed. Answer in m/s.
v̄ = (x₂ − x₁)/Δt (-9 − (-38)) / 5 = 5.8
5.8 m/s
On an east-positive axis, position changes from 5 m to 48 m in 27 s. Find the signed average velocity. Round to 3 decimal places if needed. Answer in m/s.
v̄ = (x₂ − x₁)/Δt (48 − (5)) / 27 = 1.593
1.593 m/s
Try two questions
On an east-positive axis, position changes from -18 m to -22 m in 8 s. Find the signed average velocity. Round to 3 decimal places if needed. Answer in m/s.
On an east-positive axis, position changes from -38 m to 58 m in 2 s. Find the signed average velocity. Round to 3 decimal places if needed. Answer in m/s.
Answers and reasoning
Answers and marking notes
- -0.5 m/s
v̄ = (x₂ − x₁)/Δt (-22 − (-18)) / 8 = -0.5
- 48 m/s
v̄ = (x₂ − x₁)/Δt (58 − (-38)) / 2 = 48
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.