Question

A billiard ball moving with a speed of 5 m/s collides with an identical ball originally at rest. If the first ball stops after collision, then the second ball will move forward with a speed of

• A. $10ms^{- 1}$
• B. $5ms^{- 1}$
• C. $2.5ms^{- 1}$
• D. $1.0ms^{- 1}$

Answer 1

Answer: (B)

$5ms^{- 1}$

Answer 2

In elastic head on collision velocities gets interchanged.