Mr. franklin uses a machine that has an efficiency of 80%. the machine applies a force of 800 n through a distance of 20 m. mr. franklin applies a force of 50 n on the machine. through what distance does mr. franklin apply the force?
a. 4 m
b. 16 m
c. 260 m
d. 400 m

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f