a(t) = v'(t) = 4t³ - 4t
F(t) = m·a(t) = 2·(4t³ - 4t) = 8t³ - 8t.
F(3) = 8·3³ - 8·3 = 8·3·(3² - 1) = 192.
Відповідь: 192.
<span>(a-25)^2 * (a+25)^2 = (а^2 - 50a + 625) * <span>(а^2 + 50a + 625) = a^4 + 50a^3 + 625a^2 -50a^3 - 2500a^2 - 31250a + 625a^2 + 31250a + 390625 = </span></span>