One person was doing a knee extensor muscle training, he used a dumbbell (mass = 10.2 kg) strapped to the ankle joint and was 0.4 m from the knee joint (see attached figure). The dumbbell was 0.3 m away from the knee joint in the horizontal direction. If the lever arm for the knee extensor muscle force was 0.04 m about the knee joint center, what amount of force must the knee extensor muscle produce to hold the leg in the above position? (Ignore the weight of the leg) Group of answer choices

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