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Name: _______________________ Date: _________________ Period: _____________

Honors Physics – Kinetic Energy

Rules: (a) Work must be submitted on separate paper. (b) Show all work to include the equation used, conversions must be shown, (c) Include the rearranged equation with values entered, (d) Your final answer with units and underlined. Credit will be reduced for missing elements listed above.

Show all work for full credit and underline your final answer

1. A train travels at a speed of 275 km/h. If the train has a maximum kinetic energy of 2.78 × 109 J, what is its mass?

2. Train 1 can travel at a speed up to 220.0 km/h and has a total mass of about 8.84 × 105 kg. Train 2 travels at a speed up to 320.0 km/h, and has a mass of about 4.80 × 105 kg. What are the maximum kinetic energies achieved by each of these trains?

3. If a Seal swims at a speed of 35.0 km/h with a mass of 9.00 × 102 kg, what is its kinetic energy?

4. The fastest speed achieved on Earth for any object was 15.8 km/s. If the object has a mass of 0.20 g. What is the maximum kinetic energy of the disk?

5. A ship has a mass of 7.5 × 107 kg and a maximum cruising speed of 57 km/h. What would be the kinetic energy of the ship at maximum speed?

6. A running student has half the kinetic energy that his brother has. The student speeds up by 1.3 m/s, at which point he has the same kinetic energy as his brother. If the student’s mass is twice as large as his brother’s mass, what were the original speeds of both the student and his brother? (Hint: solving quadratic equations.)

7. The kinetic energy of a ball is measured to be 1433 J. If the ball has a mass of about 47.0 g, what is the ball’s speed?

8. At the time a 55.0 kg skydiver jumps from a plane, her speed steadily increases until air resistance provides a force that balances that due to free-fall. How fast is the skydiver falling if her kinetic energy at the moment of terminal velocity is...