1. The problem statement, all variables and given/known data the questions says, "Person A who's mass is 40kg, is being pulled across the ground by a horse at a speed of 4 m/s [E]. All of a sudden the horse accelerates for a period of 5 seconds. During this time person A experiences a displacement of 40 m [E]. What net force was experienced by person A?" 2. Relevant equations 3. The attempt at a solution I have no idea how to even begin this question. I'm not sure what equations i even need to use.