The tortoise and the hare are at it again. This time, the race is a round trip. The runners have to go out, turn around a post, and return to the starting point. Your mission is to make the hare win.

The tortoise has a head start of 40.0 meters and is sticking to its strategy of moving at a constant speed. The hare's strategy is to start with a large positive velocity and accelerate so it turns around after passing the post. The hare's initial velocity is 19.97 m/s. The post is 50.0 meters from the starting line, and the hare needs one meter for its turn, so it needs to turn around at 51.0 m. To put it another way: It needs to have zero velocity at this point.

Click on the graphic on the right and set the hare's acceleration to the nearest 0.01 m/s², then press GO to see the race. Press RESET to try again.

If you have difficulty getting the hare to win, refer back to the motion equations section.