Two charged metal plates in vacuum are 15 cm apart as drawn in Fig. 24-7. The electric field between the plates is uniform and has a strength of E = 3000 N/C. An electron (q = −e, m_e = 9.1 × 10⁻³¹ kg) is released from rest at point P just outside the negative plate.

(a) How long will it take to reach the other plate? 

(b) How fast will it be going just before it hits?

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+ + + + + A 4 E = 3000 N/C 15 cm Fig. 24-7 P I