A truck with a mass of 4285 kg is moving at 9.35 m/s. It crashes into the rear end of a larger truck with a mass of 5495 kg moving at 6.35 m/s in the same direction. What is the final velocity if the trucks lock together? How much does the kinetic energy decrease in the collision?Knowns Unknowns

ma = mb = vf = ?

vai = vbi = ΔKE = ?
(remember vaf = vbf = vf)

Solve for the Unknowns

a. Use conservation of momentum to find final velocity
b. First calculate KEf and Kei, then use these to determine ΔKE

Date chapter motion and speed review part a. vocabulary review directions: write the terms that match each description below in thes complete the sentence in number 13. ich each description below in the spaces provided. the boxed letters will 1. equal forces acting in opposite directions (2 words) 2. occurs when an object's velocity decreases (2 words) 3. sum of all forces acting on an object (2 words) 4. total distance divided by total time (2 words) 5. name for the slant of a line on a graph 6. distance divided by time 7. a push or a pull exerted on a body or object 8. distance and direction of an object from its starting point 9. tendency to resist change in motion 10. measure of how far an object has moved 11. speed and direction of motion 12. rate of change of position at a specific point in time (2 words) 13. the rate of change in velocity is called motion and spe

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?