Answer
Please see the work below.
Work Step by Step
We know that
$v=350\frac{km}{h}=350\frac{Km\times 1000\frac{m}{Km}}{h\times 3600\frac{s}{h}}=97.22\frac{m}{s}$
Centripetal acceleration is given as
$a=\frac{v^2}{r}$
We plug in the known values to obtain:
$a=\frac{(97.22)^2}{7000}$
$a=1.35\frac{m}{s^2}$
