How much work is done by a force of 83 N moving an object 6 m? How much force is necessary to do the same work, but over a distance of 18 m?

2. A 22 kg body is lifted to a height of 13 m. What is the minimum work required to do it?

3. A 76 kg object rises up to 100 m in 18 s. How much power has been used?

4. A 6,500 kg car is taken to a height of 12 m in 1.5 min. What is the power that has been used?

5. What initial velocity must be imparted to a mass of 46 kg to raise it to a maximum height of 83 m? What is the total energy at any point along its path?

6. A 260 kg sled slides from rest at the highest part of a plane inclined at 43. The original height is 66 m. In the absence of friction, what is the speed of the sled when it reaches the lowest point of the inclined plane?

7. A 16 kg mass is lifted to 230 m and then released in free fall. What are the potential energy, kinetic energy, and total energy at: 

(a) the highest point,

(b) 100 m above ground level, and 

(c) on the ground?