Got the answer worng, can someone give me the correct answer please:-

IfL= 0.73 m andg= 9.81 m s−2, findTin the equation

You should give your answer with the correct number of significant figures and the correct SI units.

(N.B. You do not need to understand the underlying science in order to answer this question.)

I submitted 8.6x10-1m bit its wrong???