Mechanical Systems Question

*To*: mathgroup at smc.vnet.net*Subject*: [mg14802] Mechanical Systems Question*From*: Richard Cooper <Richard at coredump.demon.co.uk>*Date*: Wed, 18 Nov 1998 01:29:02 -0500*Sender*: owner-wri-mathgroup at wolfram.com

Hi All, I am using Mechanical Systems and need help modelling motion where the velocity of a body is dependent on its distance from a set point. For example, I have a body moving in 1D which starts with a speed of 4 m/s and is subject to a constant but unknown deceleration. The point at which the body comes to rest must be 25 m from the starting point. What is the best way to model this system (and calculate the decleration)? The following might be a good starting point. It needs one more constraint. fixed = 1; flyer = 2; start = {0, 0}; pointOfRest = {0, 25}; SetConstraints[ RotationLock1[1, flyer, fixed, 0], RelativeY1[2, Point[flyer, 0], 0], DirectedDistance1[3, Point[flyer, 0], start, {1, 0}, 4T-(a T^2)/2], Constraint[5, {}, {a, 1}] ] Cheers, Rich.