First slide

Types of collision

Question

A perfectly elastic ball P₁ of mass m moving with velocity v collides elastically with three exactly similar balls P₂, P₃, P₄ lying on a smooth table as shown. Velocities of the four balls after the collision are

Moderate

A

v, v, v, v
B

0, 2v, 3v, 4v
C

0, 0, 0, v
D

0, 0, 0, 0

Solution

In perfect elastic collision b/w bodies of equal masses they exchange their velocities.After collision between P₁ and P₂ , p₁ comes to rest and P₂ starts moving with velocity V .
For collision between P₂ and P₃ , P₂ comes to rest and P₃ starts moving with velocity V .
Finally , for collision between P₃ and P₄ , P₃ comes to rest and P₄ starts moving with velocity V.

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