Question

a 40 kg boy on a sheet of ice is initially at rest and is holding a 5 kg jug of water. He then throws the jug of water forward. If the jug has a final velocity of 3.0 m/s what is the final velocity of the boy

Answer 1

mass of boy (M)=40kg

mass of jug(m)=5kg

both are at rest so (u)=0

v of jug=3m/s

v of boy=?

Now,

using PCLM

Mu+mu=Mv+mv

0=5*3+40v

v=-15/40 m/s