Sorry don't know which language is this can't understand O_o
Answer:
The answer is C
Explanation:
F = m × a
m = 0.5kg
a = 3m/s²
F = 0.5 × 3
= 1.5N
i think it's 1400
w = Force x displacement
w = 400 x 3.5
Electric Field = E = 36.848 N/C
In accordance with Columb's law
E = k Q1 Q2 / r.r = 8.99 x 10^9 x 5.0 x 10^-6 x 5.8 x 10^-6 / 0.084 x 0.084
= 36948.6961 x 10^-3 = 36.848 N/C
We know that,
Hence, the needed force is 100N.