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Hello!

I have a question that I am currently doing and I have managed to do part a) correctly, I just have absolutely no idea how to do part b.

An object of mass 40kg is suspended by a light string from the ceiling of a lift of mass 200kg.

a) The lift accelerates upwards at 1.2ms^-2. Find the tension in the lift cable and the tension in the string.

b) The string breaks if it suffers a tension of more than 700N. Find the greatest possible tension in the lift cable if the string remains intact.Again, thanks in advance; I would appreciate not only an answer but your full workings out.

My working out for a)

To work out the tension in the cable for the object I did this:

40kg = approx 392N

(T - 40g) = 40 * 1.2

T = 440

Tension in the cable of the lift:

(T - 240g) = 240 * 1.2

T = 2640
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