look we push the ground and ground pushes us forward following newtons third law here friction coefficient is 0.9. Max friction that can act = 0.9mg This means if we apply force less than 0.9mg, then the ground will apply an equal force on us in forwards direction But if we were to push the ground with a force grtr than 0.9mg, then the feet with which we will push will slip in backwards direction coz the ground wont be able to oppose the whole force So we will have to consider static friction in this ques Hope this clears ur doubt.... Rate if it does....
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