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प्रश्न
Obtain an expression for the kinetic energy of a body of mass m moving with a velocity v?
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उत्तर
Let the body is brought to rest by a retarding force F after traveling a distance s.
From relation v2 = u2 + 2aS, retardation a =`"v"^2/(2"S")`
∴ Retarding force F = ma `="m"xx"v"^2/(2"S") =1/2("mv"^2) /"S"`
Work done W = F × S `=1/2("mv"^2)/"S"xx"S"=1/2"mv"^2`
Hence K.E = `1/2` mv2
संबंधित प्रश्न
Give one example to show that the sum of potential energy and kinetic energy remains constant if friction is ignored.
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A moving bus
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State the energy changes in the following case while in use:
an electric bulb
What is wind energy?
Give two examples each of renewable and non-renewable sources of energy?
State the energy changes which take place when:
Water stored in dams rotates turbine connected to a dynamo.
State the energy transformation on the following:
Electricity obtained from hydro energy.
Give one example when:
Chemical energy to electrical energy.
Can you tell?
Describe one natural chain of transformation of energy.
