from visual import *
track = box(pos=vector(0,-.075, 0), size=(1.0, 0.05, .10))
cart = sphere(pos=vector(0,1.5,0), radius=0.01, color=color.green)
cart.m = 0.05
cart.p = cart.m*vector(0, 0, 0)

deltat = 1.0/30
t = 0


while cart.pos.y>0:
    t = t + deltat
    rate(30)
    cart.pos = cart.pos + (cart.p/cart.m)*deltat
    ball= sphere(pos=cart.pos, radius=0.05, color=color.green)
    Fnet = vector(0, -9.8*cart.m, 0)
    cart.p = cart.p + Fnet*deltat
    print 't=', t, 'y=', cart.pos.y