A2kg block and an 8kg block are connected by a relaxed horizontal spring with spring-constant 300n/m. you pull the 8kg block with some constant horizontal force. there is a coefficient of kinetic friction between the blocks and the floor of μk = 0.3. after a time, the spring is stretched a certain constant amount, and the system moves with constant velocity. (a) draw free-body diagrams for both blocks. (b) what pulling force did you apply? (c) how much is the spring stretched?