$(5$ pts $)10.$ A small rock with mass $0\mathrm{.}500$ kg is attached to the lower end of a light string that has length $2\mathrm{.}00$ m $.$ The upper end of the string is attached to the ceiling. The rock is released from rest with the string horizontal and it swings downward in a circular arc. As the rock swings through its lowest point, with the string vertical, what is the tension in the string?

$($a$)14\mathrm{.}7$ N

$($b$)9\mathrm{.}8$ N

$($c$)4\mathrm{.}9$ N

$($d$)1\mathrm{.}5$ N

$($e$)$ none of the above answers