Массу тела можно выразить из второго закона Ньютона:
F = m * a, где по условию F (значение силы, которая действует на тело или значение равнодействующей всех сил) = 1 кН = 1 * 10^3 Н, а (ускорение, с которым начало двигаться тело) = 5 м/с^2.
m = F / a = 1 * 10^3 / 5 = 200 кг.
Ответ: Масса тела равна 200 килограмм.
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