Physics · Grades 9–12
Impulse from velocity change
Use consistent SI units and keep the stated direction convention.
Rule and assumptions
Use consistent SI units and keep the stated direction convention.
J = m(v − u)
Worked examples
A 17 kg object changes signed velocity from 12 m/s to 15 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.
J = m(v − u) 17 × (15 − (12)) = 51
51 N·s
A 13 kg object changes signed velocity from -12 m/s to 11 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.
J = m(v − u) 13 × (11 − (-12)) = 299
299 N·s
Try two questions
A 6 kg object changes signed velocity from 3 m/s to -10 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.
A 3 kg object changes signed velocity from 1 m/s to 19 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.
Answers and reasoning
Answers and marking notes
- -78 N·s
J = m(v − u) 6 × (-10 − (3)) = -78
- 54 N·s
J = m(v − u) 3 × (19 − (1)) = 54
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.