The model illustrates the conception of uniformly accelerated motion. The window on the left displays a rocket on the start. The rocket weighs 5.0N. With the sliders you may change the initial speed of rocket, the value of thrust force and the time period during which that force will act. Press ?Run? button to launch the rocket and observe the acceleration, speed and height values of a rocket in time. Estimate the maximum height of a rocket with a variable thrust, thrust time, and initial velocity. Use the play back control to check you answer. Don´t you forget that during thrust time interval two forces are exerted on the rocket: the upward thrust caused by the burning fuel ejected from the rocket and the downward gravitational force equal to the weight of the rocket?