GKFix MCQ Question

What is the expression for v1f in a one-dimensional elastic collision?

• A. v1i * 2m1/(m1 + m2)
• B. v1i * m1/(m1 + m2)
• C. v1i * (m1 - m2)/(m1 + m2)
• D. v1i * m2/(m1 + m2)