Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls to the ground. Think about the amounts of potential and kinetic energy the bowling ball has:• as sits on top of a building that is 40 meters tall. • as it is half way through a fall off a building that is 40 meters tall and travelling 19.8 meters per second. • as it is just about to hit the ground from a fall off a building that is 40 meters tall and traveling 28 meters per second. 1. Does the bowling ball have more potential energy or kinetic energy as it sit on top of the building? Why? 2. Does the bowling ball have more potential energy or kinetic energy as it is half way through its fall? Why? 3. Does the bowling ball have more potential energy or kinetic energy just before it hits the ground? Why? 4. What is the potential energy of the bowling ball as it sits on top of the building? 5. What is the potential energy of the ball as it is half way through the fall, 20 meters high? 6. What is the kinetic energy of the ball as it is half way through the fall? 7. What is the kinetic energy of the ball just before it hits the ground?
Answers
Answer & Explanation:
1. it has more potential energy as potential energy is due to the virtue of position and increases with increase in height
2. the potential and kinetic energy will be equal when it is halfway through the fall as the potential energy is getting converted to kinetic energy
3.kinetic energy as all the potential energy by now has gotten converted to kinetic energy by this time
4. mgh= 2*19.8*40= 1584 joules
5. half of the potential energy at the top i.e. 1584/2= 792 joules
6. as kinetic energy equals the potential energy halfway thru the fall, kinetic energy=792 joules
7. as potential energy gets converted completely to kinetic energy at this level it will equal to the potential energy of the ball at the top of the building that is 1584 joules