Question

A $500kg$ car, moving with a velocity of $36km{h}^{-1}$ on a straight road unidirectionally, doubles its velocity in $1min$. The average power delivered by the engine for doubling the velocity is

• A. $750W$
• B. $1050W$
• C. $1150W$
• D. $1250W$

Answer 1

The correct option is D $1250W$

$P=\frac{1}{2}\frac{m(v_2^2-v_2^2)}{t}$

$=\frac{1}{2}\frac{500({20}^2-{10}^2)}{60}$

$=1250W.$

Hence, the answer is $1250W.$