Question

select the correct answer. an athlete is working out in the weight room. he steadily holds 50 kilograms above his head for 10 seconds. which statement is true about this situation? a. the athlete isnt doing any work because he doesnt move the weight. b. the athlete isnt doing any work because he doesnt hold the weight long enough. c. the athlete is doing work because he prevents the weight from falling downward. d. the athlete is doing work because 50 kilograms is a significant load to lift.

Explanation:

In physics, work is defined as $W = F \cdot d$, where $F$ is force and $d$ is displacement. The athlete holds the weight steadily with no displacement ($d = 0$), so no work is done.

Answer:

A. The athlete isn't doing any work because he doesn't move the weight