Consider gliders that slide friction-free along a horizontal air ...

[jwb375]

Consider gliders that slide friction-free along a horizontal air track. Glider A has a mass of 1 kg, a speed of 1 m/s, and collides with glider B, which has a mass of 5 kg and is at rest. If they stick upon collision the combined-glider speed will be
 
  A) 1/4 m/s.
  B) 1/5 m/s.
  C) 1/6 m/s.
  D) 1 m/s.
  E) none of the above

Question 2

In the case of light waves, the thing doing the waving is
 
  A) charged particles throughout the region between source and receiver.
  B) a gravitational field.
  C) the ether.
  D) an electromagnetic field.
  E) the air.

[johnpizzaz]

Answer to Question 1

This is great. Thanks

Answer to Question 2

D

[jwb375]

Excellent

[rachel]

Gracias!