解:(1)a=-= 0.4 =0.8rad/s2 5 (2)O=00+at =0.8×5=4rad/s2 (3)=at2=×08×52=10rad 2006-3-152006-3-15 9 r a r at 解：(1) α = = 2 0.8rad/s 5 0.4 = = (2) ω = ω +α t 0 2 = 0.8× 5 = 4rad/s a r v n a v t a v a ′ v ϕ (3) 2 21 θ = α t 0.8 5 10rad 21 2 = × × =