A 1500-kg truck and a 1200-kg car are parked with their rear bumpers nearly touching each other in a level parking lot. Both vehicles have their brakes off so that they are free to roll. A man sitting on the rear bumper of the truck exerts a constant horizontal force on the rear bumper of the car with his feet, and the car accelerates at 1.2 m/s2. Ignore any friction between the tires and the parking lot surface. The direction of the unit vector ı^ is the direction of motion of the car. Part A What is the acceleration of the center of mass of the car-truck system?

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