An object of mass $m$ initially at rest is acted upon by a single force $f$ over a distance of $d$. If the single force is the weight of the object, and the distance that the object moved was its original height $( d = h )$, the final kinetic energy of the object is

Question

Quizplus · Accepted Answer

The final kinetic energy of the object can be found using the work-energy principle, which states that the work done on an object is equal to its change in kinetic energy. Since the force acting on the object is its weight ($f = mg$), and the distance moved is $h$, the work done is $f \cdot d = mg \cdot h$. This work done is converted into kinetic energy, so the final kinetic energy of the object is $mgh$.

An Object of Mass mmm Initially at Rest Is Acted Upon by a Single Force

An Object of Mass $m$ Initially at Rest Is Acted Upon by a Single Force