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You can't solve for the force unless you have the mass and acceleration.
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We can compute for the force the man exerts on the floor by using the formula: W = MG, where W is the weight (remember weight is a force), M is mass and G is acceleration due to gravity (9.8 m/s^2). We compute: W = (100 kg)(9.8 m/s^2) = 980 N. 
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