Объяснение:
T = 2c
ν = 1/T = 0.5 Гц
ω = 2*п*ν = 2*п*0.5 = п
A = 0.4 м
X =A*cos(ω*t) = 0.4*cos(п*t)
V = -A*ω*cos(ω*t) = - 0.4*п*sin(п*t)
Vmax = - 0.4*п*sin(п*0.5) = -0.4*3.14*1 = - 1.26 м/с
a = -A*ω*ω*cos(ω*t) = - 0.4*п*п*cos(п*t)
а мах = - 0.4*п*п*cos(п*0) = - 0,4*3,14*3,14*1 = = -4 м/с^2
ω = √(k/m) m = k / ω^2 = 30 / 3.14^2 == 3 кг
