Question

two bodies each of mass 1 kg moving his straight line but opposite in direction with the same velocity of 2m/s.they collide with each other and stick to each other after collision.what is the common velocity of these bodies after collision.

Answer 1

the common velocity will be zero (0).

let it be explained:

velocity of each =2m/s

but they are in opposite direction .

so,2-2=0m/s

Answer 2

mass=1kg.
v=2m/s.
hence,p=mv
p=1×2=2kg.m/s
momentum of first body=2kg.m/s& second body is also2kg.m/s.
now, common velocity=2/2=0m/s