# Answer on Mechanics | Relativity Question for Keseana

Question #72122

There is a drawing of a mobile crane which is supported on the wheels at A and B. The weight of the base of the crane is 28 x 10^4 N.g is the centre of mass of the base.The Jib has a weight of 3x10^4 N uniformly distributed along its length. Fa is the total upwards force from the ground on the wheels at A when the crane is lifting a load of 15 x10 ^4 N. State how you would calculate the maximum load which the crane could support in this configuration without toppling. The answer is when Fa =0 but I donâ€™t understand why ( this is from Ocr 2001)

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