Problem 9.52 Part A What is the baseball\'s speed after the collision? A 138 g b

Question

Problem 9.52 Part A What is the baseball's speed after the collision? A 138 g baseball moving 28.6 m/s strikes a stationary 5.50 kg brick resting on small rollers so it moves without significant friction. After hitting the brick, the baseball bounces straight back, and the brick moves forward at 1.25 n/s Express your answer with the appropriate units v2Value Units Submit My Answers Give Up Part B Find the total kinetic energy before the collision Express your answer with the appropriate units Kbefore = 1 Value II Units Submit My Answers Give Up Part C Find the total kinetic energy after the collision. Express your answer with the appropriate units Kafter = 1 Value Units Submit My Answers Give Up

Explanation / Answer

(A) Applying momentum conservation,

(138x 28.6) + ( 0 ) = (138 x - v2) + (5500 x 1.25)

v2 = 21.2 m/s ......Ans(A)

(B) Ki = (0.138) (28.6^2)/2 =56.4 J

(C) Kf = (0.138 x 21.2^2 / 2) + (5.50 x 1.25^2 /2 )

Kf = 35.3 J

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