$1.$ A small block of mass $\backslash ($ m $\backslash )$ slides without friction around a loop apparatus shown below. Assume all quantities are correct to $3$ significant figures.

Let

$\backslash [$

$\backslash$begin$\{$array$\}\{$l$\}$

$\backslash$mathrm$\{$R$\}=10\backslash$mathrm$\{$~m$\}\backslash \backslash$

$\backslash$mathrm$\{$~m$\}=5\mathrm{.}5\backslash$mathrm$\{$~kg$\}$

$\backslash$end$\{$array$\}$

$\backslash ]$

$($a$)$ If the block starts at rest at point A $,$ what is its speed at B $?$

Enter to $3$ significant figures

$\backslash [$

v$\_\{$B$\}=$

$\backslash ]$

$($b$)$ What is the force of the track on the block at point B $?$

Enter to $3$ significant figures

Force of track on block $=$