A salesperson claims a 1230 kg car has an average acceleration of 5 m/s from a standing start to 100 km/h. What average net force is required to do this? N A child on roller skates undergoes an acceleration of 0.7 m/s2 due to a horizontal net force of 15 N. What is the mass of the child? kg MEK PRAC If a skydiver has a net force of 300 N and an acceleration of 7 m/s2, what is the mass of the skydiver? kg