Which of the following are disadvantages of solar energy? check all that apply. a. it contributes to global warming. b. it is expensive. c. it is not equally effective for all areas of the world. d. it is not effective at all times of day.

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?