Determination for the modal age level for the grades IV and VI of the difficulty of the principle: "The amount of momentum possessed by an object depends upon its weight and speed of motion

Perkins, Walter S.2014-10-272014-10-2719531953b14684962https://hdl.handle.net/2144/9419Thesis (M.A.)--Boston Universityen-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictions.Determination for the modal age level for the grades IV and VI of the difficulty of the principle: "The amount of momentum possessed by an object depends upon its weight and speed of motionThesis/Dissertation