What is the maximum acceleration and minimum acceleration of a 1kg object under the action of three forces of 2n, 4N and 5N?

The maximum acceleration is three forces in the same direction, the same line, is a = (2 + 4 + 5) / 1 = 11
The minimum is that 2n and 4N are in the same direction as 5N, that is, A2 = (2 + 4-5) / 1 = 1

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