Question

It takes 338000 J of energy to move a car of mass 1000 kg at a speed of v. Calculate v.

Answer 1

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Explanation:

Mass of the car m=1000 kg

Initial velocity of car v1=0

Final velocity of car v2=100km/h=100×185m/s=27.78m/s

Average power of car=change in kinetic energy per unit time=t21mv22−21mv12,since v1=0

So,average power of car=t21mv22

=521×1000×27.782

=7.71×104W

$\underline\pink{Hope\: it\: helps\:you}$

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