The following data is obtained for the velocity of a vehicle during a crash test: t(ms) 0 10 20 30 40 50 60 70 80 v(mph) 30 29 27 24 18 12 5 1 0

If the vehicle weight is 2000 lb, determine the instantaneous force F (lb) acting on the vehicle at t = 35 and 55 ms. (hint: F = m dv/dt, 1 slug mass has weight 32.2 lb, 1 ms = 1e-3 s, 1 mph = 1.467 ft/s) (solve using matlab)