1. Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. What is ratio of the powers of person A and B?

2. If speed of a car becomes 2 times, its kinetic energy becomes

3. Work done by friction

4. When a coil spring is compressed, the work is done on the spring. The elastic potential energy

5. One joule work is said to be done when

6. SI unit of power is

7. Mechanical energy of a body includes

8. Commercial unit of energy is

9. Potential energy of a body depends on its