If you double the velocity of a moving object, how is it's momentum affected?

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

The two required components for a generator

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e