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Answer :

Answer:

10 m/s

Explanation:

Given

  1. mass of ball 1, m1 = 1 kg
  2. mass of ball 2, m2 = 0.25 kg
  3. initial velocity of ball 1, u1 = 10 m/s
  4. initial velocity of ball 2, u2 = 0 m/s [stationary]
  5. final velocity of ball 1, v1 = 7.5 m/s
  6. momentum of ball 2 after collision = 2.5 kg m/s

Solving :

  • We do not require all of this information
  • Only require points 2 and 6
  • Momentum = mass x velocity
  • ⇒ velocity = 2.5 / 0.25
  • ⇒ velocity = 10 m/s

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