Question $12$

$1$ points

A large pendulum with a mass of $1\mathrm{.}64$ kg swings back and forth. At the lowest point in the motion the speed is measured to be $5\mathrm{.}43\frac{m}{s}.$ How long must the pendulum be to produce a tension of $64\mathrm{.}1$ N at the lowest point of the swing? Give your answer in mks units and type the units after your numerical answer.