72.
If the velocity of an object moving at a certain height is increase 4 times, then what will be the change in the potential energy of the object?

73.
Which of the following statement regarding energy is not true?

76.
If the velocity of an object becomes twice that of its initial velocity, then its kinetic energy become n times of its initial kinetic energy. Then what would be the value of n?

79.
Which of the following is not an example of work done?

80.
A cube of mass 0.5 kg is moving at a speed of 2.0 m/s on a smooth surface. It collides with another object of 1.0 kg and both move together as a single object. What will be the energy loss during the collision?

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