Physics-
General
Easy

Question

Six identical balls are linked in a straight groove made on a horizontal frictionless surface as shown. Two similar balls each moving with a velocity v collide elastically with the row of 6 balls from left. What will happen

  1. One ball from the right rolls out with a speed 2 v and the remaining balls will remain at rest    
  2. Two balls from the right roll out with speed v each and the remaining balls will remain stationary    
  3. All the six balls in the row will roll out with speed v divided by 6 each and the two colliding balls will come to rest    
  4. The colliding balls will come to rest and no ball rolls out from right    

The correct answer is: Two balls from the right roll out with speed v each and the remaining balls will remain stationary


    Momentum and kinetic energy is conserved only in this case

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