Because of friction,

a. energy is not always conserved

b. not all potential energy is converted to kinetic energy

c. all of an object's kinetic energy turns into potential energy

d. all of an object's potential energy turns into kinetic energy

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?