11. When an object of 11 kg is at a height of 6 m from the ground, then find the energy contained in it? (g = 9.8ms-2)
12. Which one of the following is the value of 1 kwh of energy converted into joules?
13. The conversion of mechanical energy into electrical energy does not occur in
14. A car is running at a speed of 72 km/h. It takes 4 seconds to stop after applying the brakes. If the mass of the car is 1000 kg. What is the magnitude of the force exerted by the brake?
15. The energy of 9800J was used to lift the 70kg weight at which height the weight was lifted?
16. A 30 gram bullet is fired horizontally with a velocity of 150 ms-1 from a 2 kg pistol. What is the expected velocity of the pistol?
17. Formula for gravitational potential energy is-
18. The kinetic energy of an object of mass m moving at a speed of 5 ms-1 is 25J. What will be its kinetic energy when its speed will be double?
19. Product of momentum expressed as?
20. Despite . . . . . . . . working on a substance, the quality to not change in shape is called . . . . . . . .
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