Panda3D Manual: Projectile Intervals
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Projectile intervals are used to move a nodepath through the trajectory of a projectile under the influence of gravity.
    myInterval = ProjectileInterval(<Node Path>,
      startPos = Point3(X,Y,Z), endPos = Point3(X,Y,Z),
      duration = <Time in seconds>, startVel = Point3(X,Y,Z),
      endZ = Point3(X,Y,Z), gravityMult = <multiplier>, name = <Name>)
All parameters don't have to be specified. Here are a combination of parameters that will allow you to create a projectile interval. (If startPos is not provided, it will be obtained from the node's position at the time that the interval is first started. Note that in this case you must provide a duration.) startPos, endPos, duration - go from startPos to endPos in duration seconds startPos, startVel, duration - given a starting velocity, go for a specific time period startPos, startVel, endZ - given a starting velocity, go until you hit a given Z plane In addition you may alter gravity by providing a multiplier in 'gravityMult'. '2' will make gravity twice as strong, '.5' half as strong.'-1' will reverse gravity. Here's a little snippet of code that will demonstrate projectile intervals:
    camera.setPos(0,-45,0)

    # load the ball model
    self.ball = loader.loadModel("smiley")
    self.ball.reparentTo(render)
    self.ball.setPos(-15,0,0)

    # setup the projectile interval
    self.trajectory = ProjectileInterval(self.ball,
                                         startPos = Point3(-15,0,0),
                                         endPos = Point3(15,0, 0), duration = 1)
    self.trajectory.loop()
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