Question

Chapter 9

Answer 1

@ganeshie8

Answer 2

http://prntscr.com/4phy7k

Answer 3

Why it's 2mv ?

Answer 4

if you're going in east direction at velolcity `v`,
hit a wall and reverse the direction, we can say your new velocity is `-v`

yes ?

Answer 5

like this

Answer 6

So, to find the change in momentum, I'll need to find the difference between those two..

Answer 7

Exactly !

you are hitting the wall with velocity `v`
and the wall is sending you back with the same speed,
so ur velocity while coming back would be `-v`

Answer 8

yes the name says so :

`change` in momentum

Answer 9

momentum before hitting the wall : `mv`

momentum after hitting the wall : `-mv`