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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.