A 30-kg object sitting at rest is struck elastically in a head-on ...

[Zulu123]

A 30-kg object sitting at rest is struck elastically in a head-on collision with a 10-kg object initially moving at +3.0 m/s. Find the final velocity of the 30 kg object after the collision.
 a. -1.0 m/s
  c. +1.5 m/s
  b. +1.2 m/s
  d. +2.0 m/s

Question 2

The electric field associated with a uniformly charged hollow metallic sphere is the greatest at:
 a. the center of the sphere.
  c. infinity.
  b. the sphere's outer surface.
  d. the sphere's inner surface.

[succesfull]

Answer to Question 1

C

Answer to Question 2

B