Calculating Drag Force: Weight, Mass & Acceleration

[.bonbon.]

Knowing the weight, the mass and the acceleration of the object, how can I find the drag force?

I used the following formula --- "Weight – drag force = ma" --- but I'm not sure whether it is right or wrong.

Mass = 0.14
Weight = 1.34
Acceleration = 8.63

1.34 – drag force = 0.14 x 8.63
1.34 – drag force = 1.21
- drag force = -0.13
drag force = 0.13N

Thanks.

P.S. PLEASE, DON'T MOVE THE THREAD. IT IS NOT HOMEWORK.

 

[.bonbon.]

No one knows how to find the drag force?

Google gave no results either.