4. a particle starts at the point (8 m, 0 m) with a velocity of (-3 j) m/s. if it experiences a constant acceleration of (-3.5 i + 6 j) m/s2, after how much time does it cross the y-axis?

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