(A) Initial kinetic energy $K_1 = \frac{1}{2} mu^2$. Final kinetic energy $K_2 = \frac{1}{2} m(2u)^2 = \frac{1}{2} m(4u^2) = 2mu^2$. Work done $W = \D

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(A) Initial kinetic energy $K_1 = \frac{1}{2} mu^2$. Final kinetic energy $K_2 = \frac{1}{2} m(2u)^2 = \frac{1}{2} m(4u^2) = 2mu^2$. Work done $W = \Delta K = K_2 - K_1 = 2mu^2 - \frac{1}{2} mu^2 = \frac{3}{2} mu^2$. Power $P = \frac{W}{t} = \frac{3mu^2}{2t}$.

Class 11 Physics Work, Energy, Power and Collision Power

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$A$ car of mass $m$ moving with velocity $u$ on a straight road in a straight line, doubles its velocity in time $t$. The power delivered by the engine of the car for doubling the velocity is

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A
$\frac{3 mu^2}{2 t}$
B
$\frac{mu^2}{2 t}$
C
$\frac{2 mu^2}{t}$
D
$\frac{3 mu^2}{t}$

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$A$ car of mass $m$ moving with velocity $u$ on a straight road in a straight line, doubles its velocity in time $t$. The power delivered by the engine of the car for doubling the velocity is

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