An object of mass m moving at speed v strikes and object of mass ...

[sarasara]

An object of mass m moving at speed v strikes and object of mass 2m which had been at rest. The first object bounces backward along its initial path at speed v. Is this collision elastic, and if not, what is the change in kinetic energy of the system?
 a. The collision is elastic. b. The kinetic energy decreases by mv2.
  c. The kinetic energy decreases by 1/2 mv2.
  d. The kinetic energy increases by mv2.

Question 2

Of the following substances, which one contains the highest density of free electrons?
 a. glass
  c. iron
  b. hard rubber
  d. amber

[amcvicar]

Answer to Question 1

D

Answer to Question 2

C

[sarasara]

Thanks

[amcvicar]

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