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प्रश्न
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
पर्याय
only potential energy
only kinetic energy
half potential and half kinetic energy
less potential and more kinetic energy
उत्तर
During the free fall, potential energy is gradually converted into kinetic energy. At half of the maximum height, energy is equally distributed in the form of potential and kinetic energy.
Therefore, the answer is, (c) Half potential and half kinetic.
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संबंधित प्रश्न
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
Fill in the blank with suitable word :
The sum of the potential and kinetic energies of a body is called __________ energy.
Give two examples where a body possesses both, kinetic energy as well as potential energy.
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Mechanical energy into electrical energy.
Name the device or machine which convert :
light energy into heat energy.
How much electrical energy in joules does a 100 watt lamp consume : in 1 minute?
The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
Name the energy transfers which occur when :
an electric ball rings
A ball falls to the ground as shown below :
What is the potential energy of ball at B?
