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प्रश्न
A ball of mass 200 g falls from a height of 5 m. What will be its kinetic energy when it just reaches the ground? (g = 9.8 m s−2)
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उत्तर
Given, m = 200 g.
h = 5m.
When the ball reaches the ground then P.E. = K.E.
K.E. = mgh =`200/1000xx9.8xx5` = 9.8 Joule
संबंधित प्रश्न
Name five different forms of energy.
Give one example to show the conversion of potential energy to kinetic energy when put in use.
Give one relevant example for the following transformation of energy :
Electrical energy to light energy.
Select the renewable and non-renewable sources of energy from the following:
Diesel
State two disadvantages of using wind energy for generating electricity.
State four ways for the judicious use of energy.
Is it possible that a body may possess energy even when it is not in motion?
What kind of energy is possessed in a situation when?
A stone lying on the top of roof.
What is the main energy transformation that occur in:
Photosynthesis in green leaves.
Give one example when:
Kinetic energy changes to heat energy.
