1. The problem statement, all variables and given/known data When a 9.10 kg mass is placed on top of a vertical spring, the spring compresses 4.22 cm. Find the force constant of the spring. 2. Relevant equations F=kx F=ma 3. The attempt at a solution I know that Fgravity should =Fspring so I set the two above equations equal to each other and plug in the proper values. I will also convert the cm to meters so my answer has the correct units. 9.10(9.81)=k(.0422) 89.271/.0422=k k=2115.43 It wants the answer in kN/m I put 2120 first, because I thought it had the right number of sigfigs, but that was wrong. So then I put in my exact answer which was also wrong. What am I doing wrong?