A ball of mass 0.5kg moving at 10ms-1 collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

  • A 0.2ms-1
  • B 0.5ms-1
  • C 5.0ms-1
  • D 10.0ms-1
  • E 20.0ms-1

The correct answer is C. 5.0ms-1

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