Răspuns:
y= 10*sin(πt-π) (m)
st ca y= A* sin( ωt+ γ₀)
=> A= 10 m, ω= π s⁻¹ , γ₀= -π rad
v= ωA*sin(ωt+γ₀+ π/2)
v= 10π*sin(πt-π+π/2)
v= 10π* sin(πt-π/2) = 10π * sin( -(π/2-πt) )= -10π* sin(π/2-πt) = -10π*cos πt (m/s)
a= ω²A* sin(ωt+γ₀+ π)
a=10* π²* sin( πt- π+π) = 10*10* sin(πt)= 100*sin(πt) (m/s²)
obs. π² ≈ 10
