Question

A constant force $\vec{F}$ is acting on a body of mass $m$ makes it move with constant velocity $\vec{v}$ as shown in the figure. The power $P$ exerted is

• A. $F \cos \theta v$
• B. $\frac{F \cos \theta}{m g}$
• C. $\frac{F m g \cos \theta}{v}$
• D. $\frac{m g \sin \theta}{F}$

Answer 1

Answer: (A)

Power =( component of force in the direction of velocity $)|\vec{v}| $
$=F \cos \theta v $