Oct 9, 2011 #1 J Jerry Member Joined May 22, 2008 Messages 338 Reaction score 0 Points 16 horizontal roadway.? When its brakes are applied, the car stops in 6.9 s. What is the average horizontal force exerted on the car while it is braking?
horizontal roadway.? When its brakes are applied, the car stops in 6.9 s. What is the average horizontal force exerted on the car while it is braking?
Oct 23, 2011 #2 T tes2 New member Joined May 24, 2008 Messages 7 Reaction score 0 Points 1 u = 21m/s v = 0m/s t = 6.9s a = ? v = u + at -> a = (v-u)/t = -21/6.9 = -3.043m/s F = ma = 1300*(-3.043) = -3956.5N So 4000N west (two significant figures)
u = 21m/s v = 0m/s t = 6.9s a = ? v = u + at -> a = (v-u)/t = -21/6.9 = -3.043m/s F = ma = 1300*(-3.043) = -3956.5N So 4000N west (two significant figures)