The centripetal force acting on the truck as it rounds the curve must be 400N.
If the truck driver holds the wheel steady, then the path the truck takes around the corner is an arc, or segment of a circular path, basically a circle!
We can therefore calculate the centripetal force exerted on the (tires of the) truck (by the road) using equation 1).
Finding the amount (or magnitude) of the centripetal force simply requires substituting the numerical values for the physical quantities
But before we do that, let’s make sure that the units of the physical quantities
Ultimately, in the end, we want a force in newtons, N.
The velocity of the truck,
So let’s convert
So now, that our units are consistent, substituting