07_InstSolManual_PDF_Part26

# 07_InstSolManual_PDF_Part26 - 7-26 Chapter 7 yf 5 h 5 11.0...

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7.111. Set Up: Use conservation of energy to find the speed of the sled at the edge of the cliff. Let so gives or Then analyze the projectile motion of the sled: use the vertical component of motion to find the time t that the sled is in the air; then use the horizontal component of the motion with to find the horizontal displacement. Solve: Reflect: Conservation of energy can be used to find the speed of the sled at any point of the motion but does not
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Unformatted text preview: specify how far the sled travels while it is in the air. x f 5 v i, x t 5 1 17.1 m / s 21 1.50 s 2 5 25.6 m x f 5 v i, x t 1 1 2 a x t 2 : t 5 Å 2 y f a y 5 Å 2 1 2 11.0 m 2 2 9.80 m / s 2 5 1.50 s y f 5 v i, y t 1 1 2 a y t 2 : v f 5 "1 22.5 m / s 2 2 2 2 1 9.80 m / s 2 21 11.0 m 2 5 17.1 m / s a x 5 v f 5 " v i 2 2 2 gh . 1 2 m v f 2 1 mgh 5 1 2 m v i 2 K f 1 U f 5 K i 1 U i y f 5 h 5 11.0 m. y i 5 7-26 Chapter 7...
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