1. A mass of 9 kg is raised through a vertical distance of 100 m. If the gravitational acceleration is 9.8 m s-2, then the potential energy gained by the mass is   88.2 J   900 J   8820 J   980 J   Hint Half-n-half Clue   2. The maximum amount of work that can be done by a 90 kW machine in 6 seconds is   15 J   540 J   15 kJ   540 kJ   Half-n-half Clue   3. The SI unit of power is   Joule   Watt   Volt   Half-n-half Clue   4. The energy possessed by a body due to its position or configuration is called _______ energy.   thermal   sound   potential   kinetic   Half-n-half Clue   5. A machine that produces 78 J of work by using 120 J of energy has an efficiency of   13 J   42 J   35 %   65 %   Half-n-half Clue   6. A body loses 8085 J of potential energy in falling through 75 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of   825 kg   11 kg   735 kg   108 kg   Half-n-half Clue   7. Power is the rate of doing work.   True   False