An employee was at ground level, using a reach tool to pull down a loose cardboard slip sheet from a fourth level rack slot. Upon releasing the slip sheet, it fell and depressed the accelerator of an electric utility cart, causing the cart to begin to drive away and strike the corner of the racking. The employee's lower left arm was caught between the cart and the racking. The employee was hospitalized with a fractures to their radius and ulna, and required surgery.