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5.work,energy,power and collision — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
Two billiard balls undergo a head-on collision. Ball $1$ is twice as heavy as ball $2$. Initially, ball $1$ moves with a speed $v$ towards ball $2$ which is at rest. Immediately after the collision, ball $1$ travels at $a$ speed of $v/3$ in the same direction. What type of collision has occured?
  • A
    inelastic
  • ✓
    elastic
  • C
    completely inelastic
  • D
    Cannot be determined from the information given
✓

Answer

Correct option: B.
elastic
b
Solving the equation of conservation of momentum give us that the relative velocity of approach is equal to the relative velocity of separation.

Hence coefficient of restitution is $1$

Which means collision is elastic.

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