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प्रश्न
A body is falling from a height of h. After it has fallen a height `"h"/2`, it will possess
पर्याय
only potential energy
only kinetic energy
half potential and half kinetic energy
more kinetic and less potential energy
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उत्तर
more kinetic and less potential energy
Explanation:
When a body falls from a height `"h"/2` its potential energy becomes half (as potential energy = mgh ). The rest half of the initial potential energy gets converted into kinetic energy.
Hence, the body will possess half potential energy and half kinetic energy.
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संबंधित प्रश्न
Two bodies of same masses are placed at heights h and 2h. Compare their gravitational potential energy.
The gravitational potential energy stored in a box of weight 150 kgf is 1.5 × 104 J. Find the height of the box. Take 1 kgf = 10 N.
Define the term potential energy of a body.
State whether the following statement is true or false :
The potential energy of a body of mass 1 kg kept at a height of 1 m is 1 J.
A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
potential energy acquired by the weights.
A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
work done by the weightlifter
A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate the amount of work done by him. How much potential energy does he gain? (g = 9.8 m/s2)
A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? (Assume g = 10 m/s2).
Explain by an example what is meant by potential energy. Write down the expression for gravitational potential energy of a body of mass m placed at a height h above the surface of the earth.
Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation of its initial potential energy.
