Question

A body of momentum mv collides a wall elasically its ch
ange in momentum is

Answer 1

Explanation:

Initial velocity of body before collision u=−V

where minus sign indicates the body moves towards the wall.

Initial momentum of the body P

i

=Mu=−MV

Final velocity of body after collision v=V

where positive sign indicates the body moves away from the wall.

Final momentum of the body P

f

=Mv=MV

Change in momentum ΔP=P

f

−P

i

=MV−(−MV)=2MV