1. The problem statement, all variables and given/known data A man with an 70kg mass, sits on chair of 10kg, and pulls himself upwards at a acceleration of 0.2m/s^2. What is the force needed to acheive this acceleration? 2. Relevant equations F=ma 3. The attempt at a solution F=(80)*(9.81+0.2) F=(80)*(9.81-0.2) Neither are giving a correct answer, please help!