A small block slides down a frictionless track whose shape is described by y = (x^2) /d for x<0 and by y = -(x^2)/d for x>0.The value of d is d = 4.72 m. The block starts at x = 0, and is given a push to the left with an initial speed of 5.37 m/s, so it starts sliding up the track to the left. At what value of x will the block reverse direction and start sliding back down?      -1.47 m     -2.63 m     2.63 m     1.47 m

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Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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A small block slides down a frictionless track whose shape is described by y = (x^2) /d for x<0 and by y = -(x^2)/d for x>0.The value of d is d = 4.72 m. The block starts at x = 0, and is given a push to the left with an initial speed of 5.37 m/s, so it starts sliding up the track to the left. At what value of x will the block reverse direction and start sliding back down? 
   
-1.47 m
   
-2.63 m
   
2.63 m
   
1.47 m
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