A person throws a ball up into the air, and the ball falls back toward Earth. At which point would the kinetic energy be the lowest? (1 point)
An object falls through the air, gaining speed as it falls. A student claims that this creates new energy, and so it breaks the law of conservation of energy. Which statement describes why the student is incorrect? (1 point)
• Equal and opposite amounts of other energy are also created.• Energy is converted from other forms, not created.Speed is not related to energy in any way.© Energy can be created without breaking the law of conservation of energy
1. The kinetic energy would be the lowest at the highest point of the throw, when the ball is at its maximum height before falling back towards the Earth.
2. The correct statement is: Energy is converted from other forms, not created.
1) The kinetic energy of the ball would be the lowest at the highest point of its trajectory. This is because as the ball reaches its highest point, it momentarily comes to a stop and then begins to fall back down. At this point, the ball has the least amount of velocity and therefore the lowest kinetic energy.
2) The correct statement explaining why the student is incorrect is: Energy is converted from other forms, not created. According to the law of conservation of energy, energy cannot be created or destroyed but it can be transformed or converted from one form to another. In the case of the falling object, the potential energy it had initially is converted into kinetic energy as it falls. No new energy is being created, just transformed from one form to another.