重力做功,机械能守恒mgh1-mgh2=1/2mV1^2+1/2mV2^2g(h1-h2)=1/2V1^2+1/2V2^210(0.6-0.4)=1/2V1^2+1/2V2^21/2V1^2+1/2V2^2=2JAB角速度相同,线速度比等于半径比V1/V2=0.6/0.4V1/V2=3/2V1=3V2/2代入上式,得1/2(3V2/2)^2+1/2V2^2=2V2=根号16/13V1=3/2V2V1=3/2根号16/13