Aparticle moves at a speed such that its kinetic energy just equals its mass energy. what is the speed of the particle? a. 3 x 108 m/s; b. 2.6 x 108 m/s; c. 2.82 x 108 m/s; d. 2.3 x 108 m/s

Give an example for each of the following situations: 1) negative acceleration, but positive velocity 2) positive acceleration and positive velocity 3) positive acceleration, but negative velocity 4) negative acceleration and negative velocity 5) positive velocity and no acceleration