A proton moving at 3.0 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is acting down, how long does it take the proton to return to the horizontal plane? (Hint: Ignore gravity. mproton = 1.67 × 10^?27 kg, qproton = 1.6 × 10^?19 C)
a. 7.8 × 10^?7 s
b. 1.7 × 10^?6 s
c. 3.9 × 10^?6 s
d. 7.8 × 10^?6 s
a
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