1. The problem statement, all variables and given/known data A particle of mass 2kg is moving under the action of two forces. They are of magnitudes 12N and 8N, acting at an angle of 60 to each other. Find the magnitude of the acceleration of the particle and its direction relative to the direction of the 12N force. 2. Relevant equations F = ma. 3. The attempt at a solution I know that this isn't actually a tricky problem but I can't seem to think it out properly. Am I correct in decomposing both the 12N and 8N forces into vector form, i.e. 12cos60i = 12sin60j and 8cos60i + 8sin60j respectively. Then summing them and calculating both the magnitude and direction using tanθ = vj/vx. Is this correct? I'm sort of confused by the whole "relative to the 12N force" part. Thanks.