1. How many joules are in one kilowatt-hour?
2. An endloader holds 1500 kg of sand 2.00 m off the ground for 3.00 min. How much work does it do?
3. How high can a 10.0-kg mass be lifted by 1000 J of work?
4. A 40.0-kg pack is carried up a 2500-m-high mountain in 10.0 h. How much work is done?