Question

An automobile of mass 40 kg is experiencing a wind resistance of 2 kN. If the automobile is moving at a velocity of 50 km/hr, the power required to overcome the wind resistance is

• A. 43.4 kW
• B. 3.125 kW
• C. 2.5 kW
• D. 27.77 kW

Answer 1

The correct option is D 27.77 kW

$P=\text{resisting force}\times \text{velocity}$

$P=F\times V$
$=2\times {10}^3\times 50\times \frac{5}{18}=27.77\text{kW}$