at best completes the statement or answers the question. 1. Stephanie pushes an object with a force (F, ) over a displacement (). If Natalie pushes the same Stephanie. object with twice the force (2F, ) for twice the displacement (), she does A. four times the work of D. half the work of B. eight times the work of E. the same work as two times the work of 2. A post office worker pushes a box with a force of 150 N for a displacement of 15 m across a warehouse floor. How much work did the postman do? A. 2250 J C. 1850 J E. 3150 J B. 1350 J D. 950 J 3. Which of the following energy forms is associated with an object due to its position? A. intrinsic C. static E. total B. kinetic potential 4. A boy is pulling a sled with his dog on it with a force of 425 N horizontally. If he does a total of 24,500 J of work, how far did the boy pull the sled? A. 46.0 m C. 95.8 m E. 72.2 m B. 57.6 m D. 83.8 m 5. Tracy lifts a set of weights during her workout and has a power of 4150 W. If she does 8030 J of work during her lift, how much time did it take for Tracy to lift the weights? A. 2.88 sec C. 1.93 sec E. 3.21 sec B. 2.20 sec D. 1.45 sec 6. A weightlifter takes 5.3 seconds to lift a 4500 N barbell from the ground to above his head (about 2.4 meters) at a constant speed. How much power did the weightlifter use? A. 3.5 kW C. 5.8 kW E. 9.2 kW B. 7.4 KW D. 2.0 KW 7. Josie pushes a box up a ramp to a height h in a certain amount of time t. Brad pushes the same box up the ramp to the same height h in 3 times the amount of time (3t). The amount of power used by Brad is compared to the amount of power used by Josie. A. 1/3 times C. 1/9 times E. 3 times B. 9 times D. the same 8. A small car with mass 0.62 kg is moving with a velocity of 3.05 m/s. Mike pushes the car so that he adds a total of 4.75 J to the car. What is the car's kinetic energy after Mike has pushed it? A. 8.25 J C. 5.59 J E. 7.63 J B. 6.74 J D. 9.41 J