1. A constant force of 12 N in the postive x direction acts on a 4.0-kg object as it moves from the origin to the point (6i - 8j ) m. How much work is done by the given force during the displacement?

2. A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15 N force acting 20º above the horizontal. How much work is done by this force as the object moves 6.0 m?

3. A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?

4. How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?

5. A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is dony by the viscous force on the object as it falls 80 cm?

6. A block slides on a rough horizontal surface from point A to point B. A force (magnitude P=1.5 N) acts on the block between A and B, as shown below. Points A and B are 1.4 m apart. If the kinetic energies of the block at A and B are 5.0 J and 2.0 J, respectively, how much work is done on the block by the force of friction as the block moves from A to B?

7. A 2.0-kg block slides down a frictionless incline from point A to point B. A force (magnitude P=3.0N) acts on the block between A and B, as shown below. Points A and B are 2.0 m apart. If the kinetic energy of the block at A is 10 J, what is the kinetic energy of the block at B?

8. A 2.0-kg block slides down a frictionless incline from point A to point B. A force (magnitude P=3.0 N) acts on the block between A and B, as shown below. Points A and B are 2.0 m apart. If the kinetic energy of the block at A is 10 J, what is the kinetic energy of the block at B?

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