Problem 8.14 A750 kg car is stalled on an icy road during a snowstom.A 1000 kg c

Question

Problem 8.14 A750 kg car is stalled on an icy road during a snowstom.A 1000 kg car traveling eastbound at 12 m/s collides with the rear of the stalled car. After being hit, the 750 kg car slides on the ice at 4 m/s in a direction 30° north of east Part A What is the magnitude of the velocity of the 1000 kg car after the collision? Express your answer in meters per seconds to two significant figures o-9.5 m/s Submit My Answers Give Up Correct Part B What is the direction of the velocity of the 1000 kg car after the collision? Express your answer in degrees to two significant figures. Enter positive value if the direction is north of east and negative value if the direction is south of east. Submit My Answers Give Up Correct Part C Calculate the ratio of the kinetic energy of the two cars just after the collision to that just before the collision. (You may ignore the effects of friction during the collision.) Express your answer to two significant figures. | = 0.6559 Submit My Answers Glve Up Incorrect: Try Again; 4 attempts remaining

Explanation / Answer

8.14 )

C)

KEi = initial total KE = (0.5) m1 v1i2 + (0.5) m2 v2i2 = (0.5) (1000) (12)2 + (0.5) (750) (0)2 = 72000 J

KEf = final total KE = (0.5) m1 v1f2 + (0.5) m2 v2f2 = (0.5) (1000) (9.5)2 + (0.5) (750) (4)2 = 51125 J

KEf /KEi = 51125/72000 = 0.71

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