Use energy relationships to set up the problems below. When you’re ready to use your calculator, stop

2 A 100 kg dock worker pushes a 50 kg box across a floor. He pushes the box such that his arms are at an angle as shown below. If the initial velocity of the box is 2 m/s then what is the final velocity? (ignore friction)

4. What is the velocity of the dropped package after falling 1500 m?

5. A 80 kg water skier is being towed behind a speed boat as shown to the right. The 600 kg boat travels 400 m to reach 25 m/s. At the beginning of the run the boat is traveling 5 ^m/s. The boat travels with a net force of 4000 N. what force is exerted by the tether on the skier?

6. Sidney, 60 kg, on a walk-about with his pet snake Cecil. Cecil’s weight is 5 kg. Cecil is pulling Sidney with 40 N force. The two travel a across a distance of 125 m. They start their trip from rest. How much work is done by Cecil?

7 What is the velocity of the rider at the bottom of the swing?

8 A bicycle stunt rider, 100.00 kg, is about to make a great jump over some busses. His bicycle exerts a force of 5,000 N in the direction of motion. He pedals along the entire distance shown. Given the diagram below, how fast will he be traveling when he leaves the ramp?


9 What is the velocity of the glider at the top of the launch tower?

10 In an experiment, the coyote drops the ball onto a spring that compresses 6 meters. What is this spring’s spring constant?

ANSWERS