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प्रश्न
When a boy doubles his speed, his kinetic energy becomes
पर्याय
half
double
four times
no change
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उत्तर
four times
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संबंधित प्रश्न
The kinetic energy of an object of mass m moving with a velocity of 5 m s−1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
The kinetic energy of a body is the energy by virtue of its ______.
How much work is needed to be done on a ball of mass 50 g to give it a momentum of 5 kg cm s-1?
Which would have a greater effect on the kinetic energy of an object : doubling the mass or doubling the velocity?
How fast should a man of 50 kg run so that his kinetic energy be 625 J?
A ball of mass 200 g falls from a height of 5 metres. What is its kinetic energy when it just reaches the ground? (g = 9.8 m/s2)
A car of mass 120 kg is moving at a speed 18 km/h and it accelerates to attain a speed of 54 km/h in 5 seconds. Calculate:
- the work done by the engine.
- the power of the engine.
When a bell fixed on a cycle rings, then the energy conversion that takes place is ______.
