A disk with mass M,radius R is wrapped with string a block with mass m is tied at one end of the string,find the velocity of the block when it is h away from its initial rest position. M solution 2 TR△g=J mgh-Th=-my? --mvo 2 h=R△p m v=RO %=0 ,0=0,J=MR22 Amg v=2 mgh M+2m A disk with mass M, radius R is wrapped with string , a block with mass m is tied at one end of the string, find the velocity of the block when it is h away from its initial rest position.? mg T m M m solution： 2 0 2 2 1 2 1 TR  J  J 2 0 2 2 1 2 1 mghTh  mv  mv h  R v  R 0 , 0 , 2 2 v0  0  J  M R M m mgh v 2 2  