GKFix MCQ Question

Which of the following equations represents the total momentum of a system of particles?

• A. P = (m1 + m2 + ... + mn)(v1 + v2 + ... + vn)
• B. P = m1v2 + m2v1 + ... + mnvn-1
• C. P = average of all velocities times total mass
• D. P = m1v1 + m2v2 + ... + mnvn