$A$ 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
- 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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