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Answer :
Final answer:
To find the frictional force between the foot and the ground, we need to calculate the normal force and use the coefficient of friction. Given the weight of the runner and the assumed coefficient of friction, the frictional force can be determined as 546.8 N.
Explanation:
To quantify the frictional force between the foot and the ground, we need to consider the normal force and the coefficient of friction. The normal force is equal to the weight of the runner, which can be calculated as 93 kg × 9.8 m/s² = 911.4 N. The coefficient of friction depends on the material of the rubber soles and the wet concrete. Let's assume a coefficient of 0.6 for rubber on wet concrete. Therefore, the frictional force can be calculated as 0.6 × 911.4 N = 546.8 N.
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