1. The problem statement, all variables and given/known data Find V if the pulley is massless, friction less and Can take any no of variables but V is be in terms of VP.Ignore gravity and other forces 2. The attempt at a solution If Pulley comes down by X, the length of string towards left(the side not fixed) will increase by 2X Therefore, If in same time pulley comes down by VP, String will increase at rate of V=2VP. .'. the answer is V=2VP But, The answer in key states V = VP(1+cosβ) Where am I going wrong?