At which point will the riders experience centripetal acceleration?

As we know that centripetal acceleration is given as

so here we all know that radius of curvature of straight surface or flat surface is infinite or very large

So here acceleration will be zero when it move on flat surface

So here at points "w" , "x" , "z" the surface will be flat surface

and hence the observer will not experience centripetal acceleration

while at point Y the surface is curved and hence the observer will experience centripetal acceleration

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

the answer is b ) square root of 5