Intext example IV — task. Science CBSE, Class 9.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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What is the work to be done to increase the velocity of a car from

$30\ kmh^{–1}$ to

$60\ kmh^{–1}$ if the mass of the car is

$1500\ kg$ ?

The initial kinetic energy of an object of mass (

$m$ ), moving with a initialvelocity, (

$u$ ) is given by the expression,

$E_{ki} = \frac{i}{i} \times i \times i^{i}$

The final kinetic energy of an object of mass (

$m$ ), moving with a finalvelocity, (

$v$ ) is given by the expression,

$E_{kf} = \frac{i}{i} \times i \times i^{i}$

Work to be done to increase the velocity is,

Substitute the values,

Work to be done to increase the velocity

$=$

$J$

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22. Intext example IV