A circular crate has a weight of 3220 lb and it crashes into the wall. If the velocity of forward travel is 4 ft/s and it crachs after 2 s, determine the average impulsive force acting on the crate. Assume that the coefficient of kinetic friction between the wheels and the pavement is m_{k} = 0.3. 1) 2 kip 

The crate of 3220 lb is moving in with the velocity of 4 ft/s and without brakes the equation can be written as m(v_{x})_{1}
+ S F_{x} dt = m(v_{x})^{2} So the average impulsive force acting on the crate is F_{w} = 2 kip 