1. The problem statement, all variables and given/known data There is a 2450 kg car being pushed by a group of students. The car is pushed a distance of 12 m in 8.95 seconds. The coefficient of friction is .450. a) What is the net work being done? b) Work done by street? c) Work done by students? 2. Relevant equations Wnet=Kf-K0 Wf=-Ff*d d=[(v0+vf)t]/2 KE=[mv^2]/2 3. The attempt at a solution For a, Wnet=Kf-K0, and K0=0. To find Kf, I started to find Vf, using the displacement formula 12=[vf*8.95]/2 vf=2.68 sec. Then I found Kf Kf=[2450*2.68^2]/2 Since K0=0, Wnet=8798 J (same value as Kf+0) b asks for work done by street so I assumed that meant Wf. At this point, I wasn't sure how to find Ff to use in Wf=-Ff*d formula I thought Ff=μ*Fn Is Fn=m*g? Or do I multiply m*a, after finding out acceleration? Since I found Vf in the last step, do I divide that by time to find acceleration? c is work done by students, which is Wpush/applied force. Wnet=Wpull-Wf Do I add Wf to Wnet to find applied force? At this point, I don't really know what I'm doing. Can someone give me a few tips on the concepts that should be understood about this problem and explain whatever errors I'm making?