13-1.Determine the acceleration of the 150-lb block in Figure P13-1 if the coefficient of kinetic friction is 0.4. 90 lb 45 150 lb FIGURE P13-1 60 lb 30 13-3.A 130-kg cart is accelerated horizontally by a 250-N force pulling at an angle of 20 above horizontal. Neglecting rolling resistance, determine the acceleration of the cart. 13-7.At what maximum acceleration rate can a 500-N test-strength cable lift a 40-kg mass? 13-8.What force does a 180-lb man exert on the floor of an elevator that is moving downward and decelerating at 15 ft/s?