Question 1. Which, if either, requires more work- lifting a 50-kg sack a vertical distance of 2-m or lifting a 25-kg sack a vertical distance of 4m.
Question 2. A car is raised a certain distance in a service-station lift and therefore has potential energy relative to the floor. If it were raised twice as high, how much potential energy would it have?
Question 3. Two cars are raised to the same elevation on service-station lifts. If one car is twice as massive as the other, how do their potential energies compare?
Question 4. A moving car has kinetic energy. If it speeds up until it is going four times as fast, how much kinetic energy does it have in comparison to its original speed?
Question 5. An apple hanging from a limb has potential energy because of its height. If the apple falls, what becomes of this energy just before it hits the ground? When it hits the ground?