A=79 B=89C=189D=17

3. Explain about kinetic energy in your words, including information about vector, scalar, units and so on. What is the kinetic energy of a B g bullet traveling at C m/s? (10 points) 4. Explain about work done in your words, including information about vector, scalar, units and so on. How much net-work is required to accelerate a C kg car from velocity D m/s to B m/s? (10 points) 5. Explain about gravitational potential energy in your words, including information about vector, scalar, units and so on. What is the potential energy of a D kg person in a skyscraper if he is C m above the street below? (10 points) 6. Explain about spring potential energy in your words, including information about vector, scalar, units and so on. What is the potential energy stored in the spring of spring constant A+1000 N/m that compress D cm distance? (10 points) 7. Explain about momentum in your words, including information about vector, scalar, units and so on. A ball slides with initial velocity D m/s on a frictionless surface and collides with another ball with twice of mass at rest. The balls stick together after the collision. What is the final velocity of the balls? Calculate the impulse of light ball if it's mass is 1 kg? (20 points) 8. Summarize the important thing you learn in this lecture in your words? (At least 20-40 words) (10 points)