(a) A capacitor with C = 15 F is used to store energy. If this capacitor stores an amount of energy equal to the kinetic energy of a baseball (m = 0.22 kg) moving at 45 m/s (about 100 mi/h), what is the voltage across the capacitor? 

(b) If this structure is a parallel-plate capacitor with a plate area of 1200 m² (about twice the area of a basketball court!), what is the electric field between the plates? Assume there is a vacuum between the plates.