Question

A man pulls a rickshaw with a constant force of 10 kgf. As a result, the rickshaw moves with a constant velocity of 3 m/s. What is the power applied by the man?
Consider g = 10 $m/s^2$

[1 mark]

• A. 30 W
• B. 0.3 W
• C. 30 kW
• D. 0.3 kW

Answer 1

The correct option is D 0.3 kW

Given,
Force = 10 kgf = 10$\times$g = 100 N
Velocity = 3 m/s

We know that power can be expressed as the product of force and velocity

$\Rightarrow P=F\times V=(100\times 3)W$
$\Rightarrow P=300W=0.3kW$