# Math Help - Curvillinear Motion 2

1. ## Curvillinear Motion 2

Ok, this one has got me stumped. I have no idea what to do really.

Given $y^2=7x^3+7x$
where x and y are in meters and y is positive,
what is the normal component of the acceleration when
$x=3m, x=6m/s, x=4m/s^2$

I found when x = 3, y = 14.491 which i can find the magnitude and angle to plot on the x-axis. And i know i need velocity to define n-t direction, but thats all I got. I guess im confused from how its set out.
How do i approach this question?

2. You need to find an expression for $\dot{y}(t),$ so that you can compute the expressions in the other thread on which you commented. How can you do that, do you think?