This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
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 isn’t 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 una±ected 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...
View
Full Document
 Spring '08
 Stewart
 Physics, Force, Friction, Work, Velocity, OnLine Homework Problem

Click to edit the document details