9. Work & Energy
Net Work & Work-Energy Theorem
9. Work & Energy Net Work & Work-Energy Theorem
16PRACTICE PROBLEM
Sled pulls help athletes develop serious acceleration for sprinting. A sprinter pulls a sled of a mass of 45 kg on a rough horizontal grass surface. The cord makes an angle of 20° with the surface. The coefficient of kinetic friction between the sled and the grass is 0.20. The athlete runs for a distance of 25 m, pulling the cord with a constant force of 120 N. What is the sled's speed at the end of the run? Use the work-energy principle to solve this problem.
Sled pulls help athletes develop serious acceleration for sprinting. A sprinter pulls a sled of a mass of 45 kg on a rough horizontal grass surface. The cord makes an angle of 20° with the surface. The coefficient of kinetic friction between the sled and the grass is 0.20. The athlete runs for a distance of 25 m, pulling the cord with a constant force of 120 N. What is the sled's speed at the end of the run? Use the work-energy principle to solve this problem.