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  • A car accelerates from rest to u m/s. The energy spent in this process is E J. The energy required to accelerate the car from u m/s to 2 u m/s is nE J. The value of n is ______.<div class='qna-

A car accelerates from rest to u m/s. The energy spent in this process is E J. The energy required to accelerate the car from u m/s to 2 u m/s is nE J. The value of n is ______.

Option: 1

3


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

\begin{aligned} & \mathrm{E}_1=\frac{1}{2} \mathrm{mu}^2-0=\frac{1}{2} \mathrm{mu}^2=\mathrm{E} \\ & \mathrm{E}_2=\frac{1}{2} \mathrm{m(2u)^2} -\frac{1}{2} \mathrm{mu}^2 \\ & =\frac{3}{2} \mathrm{mu}^2=3 \mathrm{E} \end{aligned}

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manish

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