Rolling a die multiple times to see the average.
Answer: When the ball reaches the highest point and stops briefly.
Explanation: All thrown projectiles make a parabola, the peak of the parabola will have the greatest gravitational potential energy.
Some ways would be to use less gas-powered items, such as some stoves. Communities can encourage carpools and walking. If you were to drive, don't gun the gas and drive at moderate speeds.
In your own home you can conserve energy by turning off lights and electronic devices when not in use. You could also use energy efficient light-bulbs.
