Free 50 points because I stocked up too many points

What is work? how much work is done to move an object 0 meters?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?