How can spectroscopy and infrared technology be useful in space? (A)They can enhance speed by making spacecraft fuel more efficient.
(B)They can measure magnetic fields produced by astronomical bodies.
(C)They can provide an emergency escape to the astronaut from a space center.
(D)They can determine the elements that make up the surface of astronomical bodies.

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?