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Pad 2:40 PM * 83%. webassign.net Home My Assignments Grades Communication Calendar My eBooks Notifications Help My Options Maya Nunez PHYS 1408, section 003, Fall 2017 Instructor: Robert Duncan PHYS 1408, section 003, Fall 2017My Assignments 8 Chapter 9 Momentum (Homework) Current Score:9 17 Due Thursday, October 19 2017 02:00 PM CDT Extension Requests Print Assignment Question 1 234567 8 9 Total -m 3/3-/1 2/2-12-12 1,1 1,1 2/4 9/17(52.9%) Points Description Assignment Submission For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer Collisions Assignment Scoring Your last submission is used for your score 5. -/2 points SerPSET9 9.P025 AF My Notes Ask Your Teacher A railroad car of mass 2.54 x 104 kg is moving with a speed of 3.96 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 1.98 m/s. (a) What is the speed of the four cars after the collision? (Round your answer to at least two decimal places.) m/s (b) How much mechanical energy is lost in the collision? Hint: Active Figure 8.8 Need Help? ReadIt Submit Answer Save ProgressPractice Another Version Home My Assignments Extension Request WebAssigre 4.0 1997-2017 Advanced instructional Systems, Inc. Al rights reserved.Explanation / Answer
(A) Applying momentum conservation for the system,
Pi = Pf
(m)(3.96) + (3m)(1.98) = (4m) (v)
v = 2.47 m/s ....Ans
(B) Ki = (2.54 x 10^4)(3.96^2) /2 + (3 x 2.54 x 10^4)(1.98^2) /2
K i = 3.485 x 10^5 J
Kf = (4 x 2.54 x 10^4)(2.47^2)/2 = 3.1 x 10^5 J
Energy lost = Ki - Kf = 3.85 x 10^4 J
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