A particle moves along a straight line between two points P and Q with constant acceleration 0.8 m s–2. Its velocity at Q is 1.2 m s–1 greater than the velocity at P. If the distance PQ is 48 m, find the velocity at P. How long after passing P does it take the velocity to reach 48 m s–1.

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.

What is the momentum of an 85 kg runner traveling at 8 m/s?

Each period of the periodic table ends with: 1. alkali metals such as na, k, li, and cs 2. period 7 elements 3. group viiia elements 4. the oxygen family 5. seven orbital shells