Two  blocks  of  masses      and     Fig. 11 approach  each  other  on  a  horizontal  table  with  the  same  constant speed,     ,  as  measured  by  a  laboratory  observer.  The  blocks  undergo  a  perfectly  elastic  collision,  and  it is  observed  that     stops  but     moves  opposite  its  original  motion  with  some  constant  speed,    .  (a) Determine  the  ratio  of  the  two  masses,        .  (b)  What  is  the  ratio  of  their  speeds,       ,? 

 

Two billiard balls of equal mass undergo a perfectly elastic head-on collision. If the speed of ball 1 was initially 2.00 m/s, and that of ball 2 was 3.00 m/s in the opposite direction, what will be their speeds after the collision? 

Two billiard balls of equal mass undergo a perfectly elastic head-on collision. If the speed of ball 1 was initially 2 m/s and that of the ball 2 was 3 m/s in opposite direction, what will be their speeds after collision?

Two billiard balls of equal mass undergo a perfectly elastic head-on collision. If one ball's initial speed was 2.00 m/s, and the other's was 3.60 m/s in the opposite direction. What will be their speeds and directions after the collision?