Question

A $50\text{N}$ force is applied to the body of $2\text{kg}$. This applied force maintains the velocity of the body at $2\text{m/s}$. If the body moves in perpendicular direction to the applied force, find the power delivered by the force.

• A. $100\text{W}$
• B. $0\text{W}$
• C. $50\text{W}$
• D. $200\text{W}$

Answer 1

The correct option is B $0\text{W}$

Power is given by $P=Fv\cos \theta$
Here, angle $\left(\theta \right)$ between applied force and velocity is ${90}^{\circ }$
So, $P=50\times 2\times \cos {90}^{\circ }$
$\Rightarrow P=0\text{W}$