- #1
kellyxx
- 3
- 1
Homework Statement
A boy is holding a box and moving at a constant velocity of 2m/s on ice. The masses of the boy and the box are 40kg and 2kg respectively.Then the boy drops the box. What is the momentum of the boy just after dropping the box? Assume that the friction between the boy and the ice is negligible.
2. The attempt at a solution
I've tried to apply the conservation of momentum (m1u1+m2u2=m1v1+m2v2)
(40+2)(2)=2(0)+40v then v=84 kgms-1, but the correct answer should be 80kgms-1