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The electric field above the surface of the Earth is approximately 150 N/C, pointing downward toward the Earth's

surface. Suppose a proton is fired from the surface of the Earth at a speed of v = 6.25 × 10^5 m/s.

a) What is the maximum height the proton reaches?

b) When the proton impacts the ground, how far horizontally is it from where it was fired?



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