Physics · Grades 8–11
Acceleration from two readings
Use consistent SI units and keep the stated direction convention.
Rule and assumptions
Use consistent SI units and keep the stated direction convention.
a = (v₂ − v₁)/Δt
Worked examples
Signed velocity changes from 19 m/s to 5 m/s in 5 s. Find the average acceleration. Round to 3 decimal places if needed. Answer in m/s².
a = (v₂ − v₁)/Δt (5 − 19) / 5 = -2.8
-2.8 m/s²
Signed velocity changes from 13 m/s to 25 m/s in 4 s. Find the average acceleration. Round to 3 decimal places if needed. Answer in m/s².
a = (v₂ − v₁)/Δt (25 − 13) / 4 = 3
3 m/s²
Try two questions
Signed velocity changes from 14 m/s to 4 m/s in 11 s. Find the average acceleration. Round to 3 decimal places if needed. Answer in m/s².
Signed velocity changes from 27 m/s to 9 m/s in 6 s. Find the average acceleration. Round to 3 decimal places if needed. Answer in m/s².
Answers and reasoning
Answers and marking notes
- -0.909 m/s²
a = (v₂ − v₁)/Δt (4 − 14) / 11 = -0.909
- -3 m/s²
a = (v₂ − v₁)/Δt (9 − 27) / 6 = -3
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.