Question A 63.0-kg sprinter starts a race with an acceleration of $4.20 \textrm{ m/s}^2$. What is the net external force on him? Question by OpenStax is licensed under CC BY 4.0. Final Answer $265 \textrm{ N}$ Solution Video OpenStax College Physics Solution, Chapter 4, Problem 1 (Problems & Exercises) (0:17) Rating PoorNot so poorAverageGoodVery good Save 3 votes with an average rating of 5. Calculator Screenshots