An object initially at rest suddenly explodes in two fragments of ...

[vicky]

An object initially at rest suddenly explodes in two fragments of masses and that move in opposite directions. If the speed of the first fragment is find the internal energy of the explosion.
 
  A) 38 J B) 30 kJ C) 30 J D) 38 kJ

Question 2

In pair creation,
 
  A) matter is conserved but energy is created.
  B) two oppositely-flavored pizzas are created.
  C) matter and energy are both conserved.
  D) matter and energy are both created.
  E) matter is created but energy is conserved.

[randomguy133]

Answer to Question 1

C

Answer to Question 2

E