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प्रश्न
When a boy doubles his speed, his kinetic energy becomes
विकल्प
half
double
four times
no change
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उत्तर
four times
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संबंधित प्रश्न
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.
State two factors on which the kinetic energy of a moving body depends.
A body falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.
Write an expression for the kinetic energy of a body of mass m moving with a velocity v.
If the speed of a body is halved, what will be the change in its kinetic energy?
When a ball is thrown inside a moving bus, does its kinetic energy depend on the speed of the bus? Explain.
The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be :
An apple falling from a tree is an example for kinetic energy.
What is energy of motion? Give examples.
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.
