1. The problem statement, all variables and given/known data Two forces F1 and F2 are acting on a mass M=4kg. The force F1 = 11i + 5j + 7k, in N. The acceleration of the mass is given by a = 3i + 7j + 4k, in m/s2. Calculate the magnitude of F2 . 2. Relevant equations F = ma 3. The attempt at a solution Ok so what I tried here is doing F1 + F2 = ma so F2 = (ma)- F1 I took a = 3i + 7j + 4k and multiplied all of the components by 4kg got 44i+20j+28k and then subtracted F1 = 11i + 5j + 7k and got 41i+13j+24k kg*m/s^2 what do I do?