The cart would travel 2 meters. If at first, the cart moving 0.5 m/s only traveled 1 meter when the air was shut off, we can assume that the doubling of the speed also doubles the distance traveled when the air is shut off again.
Yes. Your weight is pulling you to center of the world. Weight is a force (gravity).
And since you're still on where you sit, the thing you're sitting on, exerts an equal force to your weight. That's stated in Isaac Newton's third law of motion. Simply 'For every action, there is an equal and opposite reaction.'
Answer:
to turn red litmus blue and react with acid to form salt