I need help with these questions

In a collision, an automobile of mass 1200 kg stops with constant acceleration in 2 m from an initial speed of 22 mKs. (a) What is the acceleration of the car? {In} What is the net force on the car during the collision? Find the direction and magnitude of the net force on the object in figure 45 N 450 20 N 30 NIn figure the string and the pulley are massless. The coefficient of kinetic friction between the block and the surface is 0.2. If m, = 10 kg and m2 = 5 kg, find (a) the tension in the string; (b) the acceleration