The four-wheeler has a weight of 335 lb and a center of gravity at G₁, whereas the rider has a weight of 150 lb and a center of gravity at G₂. If the coefficient of static friction between the rear wheels and the ground is μ_s = 0.3, determine the greatest acceleration the vehicle can have without tipping over. The front wheels are free to roll. Neglect the mass of the wheels in the calculation.

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A G₁ G₂ -2 ft1 ft2 ft- B 2 ft 1 ft