# Elastic&inelastic collisions

Feb 3rd, 2012
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Example problem: Two balls of masses mA=45 g and mB=65 g, are suspended as shown above. Ball A is pulled to a 66o angle as shown and released from rest. a. What is ball A’s velocity immediately before it hits ball B? (10 points) Total of 3 example problems. Solutions with detailed explanation.

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Practice Test1.A 1600 kg Honda travelling at 28.0 m/s collides with a 2400 kg Town Car moving in thesame direction at 15.0 m/s.a) Determine the final velocity of the Town Car if the Hondas speed after the collision drops to13.0 m/s. (10 points)From conservation of momentum we haveM1 V10+ M2V20 = M1V1+M2V2Solve for V2V2 = (M1 V10+ M2V20 - M1V1)/M2=(1600*28+2400*15-1600*13)/2400= 25 m/sb) Calculate the initial and final KE of the system. (10 points, 5 for initial KE and 5 for final KE)Initial Ke M1 V102+ M2V202 = 1600*282+1/2*2400*152=897200 JFinal Ke M1 V12+ M2V22 = 1600*132 +1/2*2400*252=885200 Jc) Is this collision elastic, inelastic, or neither? (5 points)It is inelastic collisiond) Explain (5 points)Because Ke is not conservative.A=3.00 kg7.50 m2.50 m2. Block A is poised at the top of an incline that is located 2.5 m above the horizontal.

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