через t=2 секунды:
X1 = 0
y1 = v*t — g*t^2/2 = 25*2 – 10*4/2 = 30 м
x2 = 2 * 25 * cos(60°) = 2 * 25 * 0.5 = 25 м
y2 = v*t — g*t^2/2 = 25 * sin(60°) * 2 — 10*4/2 = 50 * sqrt(3)/2 – 20 м
расстояние d = sqrt((x1-x2)^2 + (y1-y2)^2) = sqrt((0 – 25)^2 + (30 — 50 * sqrt(3)/2 + 20)^2) = sqrt(25^2 + (50 * (1 — sqrt(3)/2))^2) = sqrt(25^2 + (50^2 * (1 — sqrt(3) + 3/4))) = sqrt(625 + (2500 * (1.75 — sqrt(3)))) = 25.8819045103 м