1. The problem statement, all variables and given/known data A skier of mass 67 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 40 m up a 30° slope (assumed frictionless) at a constant speed of 1.7 m/s? m= 67kg Delta y= 40m Theta= 30 degrees v= 1.7m/s 2. Relevant equations I know that: F=ma W= F cos(Theta) (Delta y) 3. The attempt at a solution I am solving for the force: F=ma F= 67 (1.7) F= 113.9 N/m With F solved I use my Work Equation: W= F cos(Theta)(Delta y) W= 113.9 (cos30) (40) W= 3945.61 J W= 3900 J My answer differs from the correct answer by 10% to 100% What am I doing wrong? Am I using the wrong equations?