A$.2-kg$ block slides down a $30$ incline as shown above with an acceleration of $2\frac{m}{s^2}.$

Which of the following diagrams best represents the gravitational force $W.$ the frictional force $f$ and the normal

force N that act on the block?

$($A$)$

Which of the following correctly indicates the maguitudes of the forces acting ap and down the incline?

$($A$)20N$ down the plane, $16N$ up the plane

$($B$)4N$ down the plane, $4N$ up the plane

$($C$)0N$ down the plane, $4N$ up the plane

$($D$)10N$ down the plane, $6N$ up the plane