$(4)$ Using $n-$t coordinates, find the velocity and normal force on the block at position $B$ as a function of $.$ Neglect friction.

The velocity at position $A$ is $3\frac{m}{s}.$

Make sure to draw the correct $n-$t axes for the block!

Note: you will need to use the kinematics

$x_t=\frac{dv}{dt}=v\frac{dv}{ds},v=\frac{ds}{dt}$

and arc len th equation!