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Hi,

Could you please have a look on the attachment?

Why is this differential equation non-linear? Is it [itex]u=\overset{\cdot }{m}[/itex] which makes it non-linear?

I think one can consider [itex]x_{3}[/itex] , k, and g to be constants. If it is really [itex]u=\overset{\cdot }{m}[/itex] which makes it non-linear then I don't think it's possible to make it linear. Could you please correct me?

What is there in "These expressions" which shows that the system is linear? Is it "0 x u"?

Could you please have a look on the attachment?

**Question 1:**Why is this differential equation non-linear? Is it [itex]u=\overset{\cdot }{m}[/itex] which makes it non-linear?

I think one can consider [itex]x_{3}[/itex] , k, and g to be constants. If it is really [itex]u=\overset{\cdot }{m}[/itex] which makes it non-linear then I don't think it's possible to make it linear. Could you please correct me?

**Question 2:**What is there in "These expressions" which shows that the system is linear? Is it "0 x u"?

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