I'm having difficulties on the ways to approach this problem:

Three forces act on a particle that moves with a constant velocity v = 2m/s x − 7m/s y. Two of the forces acting on this particle are F1 = -9.0N x + -9.0N y + -1.0N z and F2 = = 7.0N x + -9.0N y + 9.0N z. What is the magnitude of the third force?

Question

I'm having difficulties on the ways to approach this problem:

Three forces act on a particle that moves with a constant velocity v = 2m/s x − 7m/s y. Two of the forces acting on this particle are F1 = -9.0N x + -9.0N y +  -1.0N z and F2 = = 7.0N x + -9.0N y +  9.0N z. What is the magnitude of the third force?

raffle_snaffle · Answer

Draw a FBD.

raffle_snaffle · Answer

If you draw a free body diagram you should have a better idea on how to solve the problem.

anonymous · Answer

I tried but I am not really familiar with the Z vector, so I'm getting a little lost