Hi, I'm having problems with 4. (a)(iii) and (b)(iii). Question and solution attached below. For 4.(a)(iii) this is what I've tried (for mass I've used the mass of the wagon plus drum): F = Fu + Ff + Fw = (ma) + (mg x cosangle x friction coefficient) + (mg x sinangle) = 2550 x 0.412 + 2550 x 9.81 x cos10 x 0.02 + 2550 x 9.81 x sin10 = 1050.6 + 419.8 + 13608.96 = 15079.4Nm (b)(iii) Help is much appreciated.