After being released, the $2\mathrm{.}0$ kg block accelerates to the right along the frictionless track as the $1\mathrm{.}0$ kg block accelerates downward. The pulley is massless and frictionless. What is the tension in the string?

A$.9\mathrm{.}8$ N

B$.6\mathrm{.}5$ N

$2\mathrm{.}0$ kg

C$.3\mathrm{.}3$ N

D$.4\mathrm{.}9$ N

E$.10$ N

$1\mathrm{.}0$ kg