21. Potential energy = ?
22. During the free fall of the object, the decrease in potential energy, at any point in its path, appears as an equal amount of increase in
23. An object was thrown vertically upwards and it reached a maximum height 'h' from the ground. While going over it, the object at $$\frac{1}{4}$$ of height 'h' will have . . . . . . . .
24. If an object with a mass of 25 kg is moving with the same acceleration as 8ms-2, then the force exerted by the object is . . . . . . . .
25. Which energy is in the water stored in the dam?
26. An object of 20 kg is raised through a height of 2m, what will be the work done by the force of gravity on the object?
27. An object moving with the uniform velocity of 4m/s has a kinetic energy of 120J. Find the mass of the object?
28. What is the kinetic energy of a bullet when a bullet is fired from a gun?
29. A block of 2 kg slides on a parallel surface at a speed of 4 m/s. It falls on an uncompress spring and presses it until the block becomes completely motionless. The value of kinetic friction is 15N and the spring constant is 10000N/m. spring presses-
30. A car running at high speed, which energy does it contains?
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