Question

Two bodies of mass 1 kg and 2 kg respectively
moving in the directions opposite to each
other with a speed 5 m/s collide. Calculate
the total momentum of the system before
collision
(Ans. - 4 kg m/s)​

Answer 1

Total momentum before collision :

1 kg * 5 m/s + 2 kg (-5m/s) = - 5 kg-m/s

It is in the direction of motion of 2kg mass