A trolley with a mass of 1000 kg having a horizontal speed of V = 2.5 m/s strikes a vertical pole OA at point A. The vertical pole embedded at point O has a square cross-section of (0.18 m 0.18 m). The material properties of the pole are the elastic modulus of the material E= 21011 N/m2 and the shear stiffness modulus of the material G= 7.71010 N/m2. Calculate : (a) The impact force at point A. b) The horizontal displacement of the OA pole at point A due to the force of the impact