动力学 P=mvc cos op+mvc sin e P AB m(lo cos 45+losin 0) 2 √2 mlo( mmo B 222√102 777 34 nlo 2 cosa- pr 4 COS B       ml ml m l l p mv mv y C C 2 2 10 1 2 5 2 2 2 1 2 5 45 2 1 1 2 =  +  = = + = + ( ) ( cos sin ) cos sin  p px py ml 2 2 2 34 = + = 17 1 17 4 = = − = = p p p px y cos , cos 