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प्रश्न
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उत्तर
K .E, K = `1/2` mv²
If speed is doubled
K.E, K' = `1/2` m (2v2)
or K' = 4 x `1/2` mv2 = 4K
Thus K.E becomes four times.
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संबंधित प्रश्न
Define 1 J of work.
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Give one example in which a force does zero work.
Explain by an example that a body may possess energy even when it is not in motion.
The work done on an object does not depend on ______.
Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.
Give two examples of couple actions in our daily life.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
