Answer
$F = 1.6\times 10^{-26}~N$
Work Step by Step
We can find the magnitude of the gravitational force on the proton:
$F = ma$
$F = (1.67\times 10^{-27}~kg)(9.8~m/s^2)$
$F = 1.6\times 10^{-26}~N$
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