You wish to lift a weight by a vertical distance(H) of 15 ft. You can
generate a maximum pushing force (E) of 200 lb with an inclined
plane that is 30 feet long (L).

Work input in = 3,000ft.lb

Explanation:

Question: You wish to lift a weight by a vertical distance(H) of 15 ft. You can

generate a maximum pushing force (E) of 200 lb with an inclined plane that is 30 feet long (L). What is the amount of work you must input in order to move the weight?

Solution:

Effort Force = 200lb

Distance = height = 15ft

Length of inclined plane = 30ft

Recall, Energy you put in = Energy you get out

Hence, work in = work out

Neglecting friction losses

Load force × distance (upward) = effort force × distance (downward)

Work input in = Effort force × distance

Work input in = 200×15

Work input in = 3,000ft.lb

the answer would be 2

since they are only saying that the couple has 20 daughters and so on but they never said that they went to the movies as well therefore the couple was the only people that went to the movies.

hope this ! : 3