Question

which force best represents $f_g$? a weight lifter is pushing a barbell upward with a force of 90 n. the weight of a barbell acting on a weight lifter is 90 n. the amount of upward force of a table on a box is 25 n. a box on a rough table has difficulty sliding past 25 n of force.

Explanation:

$F_g$ represents gravitational force (weight). The weight of a barbell acting on a weight lifter is due to gravity, matching $F_g$. Other options are applied force, normal force, or friction, not gravity.

Answer:

B. The weight of a barbell acting on a weight lifter is 90 N.