# Alfred's antics again

One day, Alfred wanted to show off to his elder sister, Brenda, how powerful his motorbike was. He rode his motorbike with Brenda riding pillion and accelerated from rest to $$24 \text{ m/s}$$ in 3 seconds. If the total mass of Alfred, his motorbike and Brenda is 400 kg and his motorbike engine exerts a constant driving force of 4000 N, find the average resistive force in Newtons.

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