Calculating the Spring Constant for a 9.10 kg Mass on a Vertical Spring

[BHFCBabe]

Homework Statement

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.

Homework Equations

F=kx
F=ma

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?

 

[Andrew Mason]

Homework Statement

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.

Homework Equations

F=kx
F=ma

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?

Hint: kN/m?

AM

 

[BHFCBabe]

I realized that about an hour later. Thanks.