For us to know the mass of ball 2, we will be
using the law of momentum conservation which is the momentum before collision
and the momentum after collision (m1v1+m2v2=m1v1+m2v2):
(10×20) + (m×−20) = (10×−40) + (m×0)
200 − 20m = −400
Since we are looking for “m” which is the mass of
ball 2, derivation will be needed.
Then:
m = (−400−200) / (−20) = 30kg
Therefore, it is concluded
that the mas for ball 2 is 30kg.
