X=400+10t-10t^2m=5кгRx-?​

Question

X=400+10t-10t^2m=5кгRx-?​

Answer 1

a(x) = x''(t) = (10-20t)' = -20 м/с².

Rx = m|a| = 5кг*20м/с² = 100 Н.

ответ : Rx = 100 H.