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'13. A 2 kg object traveling at 40 m/s east collides perfectly elastically with a 3 kg object travelling at 30 m/s west. What is the Kinetic Energy of the system after the collision? A) 2950 J B) cannot be determined C) 34 N D) 34 J Free Response - Solve each problem, showing all work. Partial credit may be given. p = mv EF = ma W = Fd parallel KE = -my2 Ep = mv +m2 V2 + ... J = Ap Fir = HK FN E. + W = Es 2 miv , + m 2 V 2 = miv, + m 2 V2 J = mAv w = mg U. = mgh U, =-1x2 J = FAt 2 VI tv, = V2 + V2 alm pxa 14. A small cube, with a mass of 3 kg, slides along a frictionless horizontal surface at a constant speed of 15 m/s until it collides with, and sticks to, a large wooden 4.5 kg block. The large block is attached to the left end of a spring with a spring constant of 80 N/m as shown in the diagram. UNITS COUNT a. What is the momentum of the cube before the collision? b. What is the kinetic energy of the cube before the collision? c. Find the speed of the combined cube and block system just after the collision. d. Find the kinetic energy of the cube-block system just after the collision