A hanging mass M is connected to a 4M block on a frictionless horizontal ice slab by the pulley-string system shown. A horizontal pull 2Mg acts on the 4M block. If string tension is (x/5)Mg, find x.

Question

G1 Physics · Accepted Answer

Let block acceleration be a and hanging mass acceleration be related by the string. Solving Newton's equations and the string constraint gives T=(6/5)Mg. Therefore x=6.