A softball having a mass of 0.250 kg is pitched at 99.6 km/hr. By the time it reaches the plate, it may have slowed by 10.8 percent. Neglecting gravity, estimate the average force of air resistance during a pitch, if the distance between the plate and the pitcher is 15.2 m. F=ma Fdrag=(1/2)pACv^2 p=density, A=cross sectional area, C=drag coefficient Vf^2=Vi^2 + 2a(X-xi) I converted the velocity into m/s and and then found the final velocity as it reached 15.2 m and plugged them into the 3rd equation to find the acceleration. After that I used F=ma knowing the acceleration and mass. This still wasnt right.