1. The problem statement, all variables and given/known data Sam, whose mass is 67 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 230 N and a coefficient of kinetic friction on snow of 0.13. Unfortunately, the skis run out of fuel after only 12. 2. Relevant equations F-Fk=mA (Vx)f = (Vx)i + (Ax)(Delta Time) Xf=Xi+((Vx)i)(delta Time) + .5(Ax)(Delta Time)^2 3. The attempt at a solution Well I first started out by find the acceleration: 230-(.13)(67)(9.8)=67Ax Ax=2.15 So I plugged that into the equation to find the max speed... (Vx)f= 2.15 x 12 = 25.8 m/s rounded to 2 sig figures 26 m/s According to mastering physics Im correct up to here. Finding the distance traveled is where Im getting the answer incorrect. I tried using the equation Xf=Xi+((Vx)i)(delta Time) + .5(Ax)(Delta Time)^2 Xf= 0 + (26)(12) + .5(2.15)(12)^2 = 466.8 M Mastering physics ask for it to be rounded to 2 sig figures giving 470 m. But yet that answer is incorrect. What am I doing wrong? If somebody can help me I'd appreciate it. Thanks!