Answers by visitors named: Horatiu

You can use F=m(a+g). So F=88(9.8+14)-------->2094.4N

First off the normal force is m*a so 14kg * 9.8 is 137.2N. Since the person isn't pushing straight not all force goes directly to moving the chair. So 137.2=xcos30. x=158.42N.