[tex]t=20s\\l=25m\\P=20W\\\\W = P\times t\\W = 20W\times 20s = 400J\\\\W = F\times l|\div l\\F = \frac{W}{l} \\F = \frac{400J}{25m} = 16N[/tex]
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[tex]t=20s\\l=25m\\P=20W\\\\W = P\times t\\W = 20W\times 20s = 400J\\\\W = F\times l|\div l\\F = \frac{W}{l} \\F = \frac{400J}{25m} = 16N[/tex]