7-34 A superball
of mass 22 g rolls with a speed of 3.5 m/s toward another (stationary)
superball of mass 27 g. If the balls have a head-on elastic collision,
what are the velocities (magnitudes and directions) of the balls after
the collision?
[Ans. 3.1 m/s forward
and 0.4 m/s backward]
ACCUMULATED SOLUTION
Correct!
If any unknown
velocity is actually negative a minus sign will appear in the solution.
In terms of m1,
m2,
v1' and
v2' what is the expression
for the conservation of momentum according to the choice in the drawing
(B)?
(A) m1 v1 = m1 v1'+ m2 v2'
(B) m1 v1 = -m1 v1'+ m2 v2'
(C) m1 v1 = m1 v1'- m2 v2'