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Unformatted text preview: (d) velocity is nonzero and acceleration is zero. (e) Toby Solution In general, twodimensional, frictionless projectile motion has both horizontal and vertical components (and if there isnt any crosswind, we can turn threedimensional motion into twodimensional motion by choosing our coordinate system appropriately). Gravity acts in the vertical direction only, so the horizontal component of the initial velocity is unaected by gravity ( v x ( t ) = v ,x n = zero ). The vertical motion is uniformly accelerated (the acceleration due to gravity is always present), and so is quadratic in time. And so x ( t ) = x + v ,x t and y ( t ) = y + v ,y t 1 2 gt 2 and the vector position function is V r ( t ) = p x ( t ) y ( t ) P 2 The xy graph of this function (parameterized by t ) is a parabola. Total Points for Problem: 2 Points 3...
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This note was uploaded on 05/04/2008 for the course PHYS 2054 taught by Professor Stewart during the Spring '08 term at Arkansas.
 Spring '08
 Stewart
 Physics, Friction, Work

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