A $4\mathrm{.}90-$kg object oscillates on a horizontal spring with an amplitude of $3\mathrm{.}90$ cm $.$ Its maximum acceleration is $26\mathrm{.}0($m$)/($s$^(2)).$

Find the force constant k of the spring.

k$=$

$,$L$\_($Correct Answer $)$

$($N$)/($m$)$

Find the frequency f of the object.

f$=$obrace$($ Incorrect Answer $)$Hz

Find the period T of the motion of the object.

T$=$s