A stone of mass M lies on a horizontal plane at a distance L from the edge of the abyss. A rope is attached to the stone, thrown over a smooth ledge; A monkey of mass m is climbing a rope. With what constant (relative to the ground) acceleration must she climb in order to rise before the stone falls? The initial distance from the monkey to the ledge is H (M/m)L. The coefficient of friction between the stone and the plane is k.
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