1. 1500j of work was done to move a box 20m. What force was applied to the box ?

2. How much gravitational potential energy does a 165kg roller coaster car have when it is at the top of a hill 42 meters above the ground?

Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places