Homework Help: physics

Posted by bob on Friday, December 3, 2010 at 2:53pm.

A billiard ball traveling at 8.0 m/s has an elastic collision with a second billiard ball of equal mass that is at rest. After
the collision, the first ball is at rest. What is the velocity of the second ball after the collision?

physics - dida, Wednesday, March 30, 2011 at 3:50pm
v1=8m/s, v2=0 , m1=m2->m , v=?
m1*v1+m2*v2=(m1+m2)*v
m*8+m*0=(m+m)*v
8m=2m*v
8m/2m=v
4=v

v=4m/s

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