Currently i have been studying The standard model and quantum physics for almost a year, from the research i have done there seems to be so many things that lead to more things and so on. How should i plan my research so i can learn everything i need to learn?

May someone explain how to do this question?

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j

Could someone me find the answer to this problem.