Question

A ball has 380 j of potential energy when it rests at the top of a hill. After set into motion, when the ball reaches the ground level, how much kinetic energy will the ball have?

1) 0 j
2) 190 j
3) 380 j
4) 760 j

Answer 1

Using the law of conservation of energy, when the ball reaches the ground, it will have the same amount of kinetic energy as it had potential energy at the top of the hill, which is 380 joules.

Step-by-step explanation:

The question deals with the concepts of gravitational potential energy and kinetic energy within the field of physics. When the ball rests at the top of the hill, it has 380 joules (J) of potential energy. According to the law of conservation of energy, the total energy in an isolated system remains constant, assuming no energy is lost due to friction or air resistance. Therefore, when the ball reaches the ground, all of its potential energy will have been converted into kinetic energy.

Since no energy is lost, the kinetic energy of the ball at the ground level will be equal to the potential energy it had at the top of the hill. Thus, when the ball reaches the ground, it will have 380 J of kinetic energy.