A baseball traveling horizontally strikes a rigid vertical wall at a speed of 35 m/s and returns at a speed of 30 m/s, as sketched in Figure P4-39a. It is of interest to find the maximum force exerted on the wall by the impact. Only the time in- terval during which the ball and the wall are in contact 30 m/s 35 m/s (a) The impact. F max 0 Force 0.005 0.010 0.015 0.020 0.025 (b) Assumed force versus time profile. FIGURE P4-39 t(s) is known as 0.025 s. So, as a rough estimation, the force versus time plot is approximated as a parabola as sketched in Figure P4-39b. Estimate the maximum force Fmax.