Remember that a is equal to the slope of a velocity vs time graph.
a = 0.1 m/s / 0.1 s = 1 m/s^2
And now we use F = ma (but remember that m needs to be in kg not g)
F = 0.025 kg * 1 m/s^2 = 0.025 N
0.025 N / 0.25 = 1/10
The answer is (C)
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