A wooden block of 100 kg is about to be pushed on a floor of coefficient of friction 0.4. What is the magnitude of the force of friction on the wooden block when it is just pushed ?

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392N

294N

196N

490N

answer is A.

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Detailed Solution

m = 100kg ; µ = 0.4F = µN = µmg = 0.4 × 100 × 9.8F = 392N

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