I think the answer is from the TIPERs book solution. I would appreciate if you could double check the answer key and let me know. Thanks again for your help!
Here is the original question. It is from TIPERs Sensemaking Tasks for Introdutory Physics. I am really puzzled by the answer keys. Thanks for answering my question.
Homework Statement
A 100N box is initially at rest on a rough horizontal surface. The coefficient of static friction between the box and the surface is 0.6 and the coefficient of kinetic friction is 0.4. A constant 35N force is aplied to the box horizontally.
Identify from choices (a) - (e)...