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प्रश्न
A ball falls to the ground as shown below :
Which law you have made use of in answering this question?
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उत्तर
Law of conservation of energy is used in answering these questions.
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संबंधित प्रश्न
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
State whether the object possess kinetic energy, potential energy, or both :
A man climbing a hill _____________.
State whether the object possess kinetic energy, potential energy, or both :
A ceiling fan in the off position ______________
What kind of energy is possessed by the following?
A stone kept on roof-top _______________
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his potential energy at the highest point? (g = 10 m/s2)
Give two examples where a body possesses both, kinetic energy as well as potential energy.
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
Name the energy transfers which occur when : a torch is on
Which of the following energy change involves frictional force?
A girl with having a mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4 m s–1 by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?
