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The Brainliest Answer!
2015-07-25T16:57:40+05:30
Convert the momentum into components as parallel to the wall and perpendicular to the wall.

Initial momentum = 5 kg m/s
perpendicular component = 5 cos 45 = 5/√2 kg m/s
parallel component = 5 sin 45 = 5/√2 kg m/s

After hitting the wall, it reflects at same angle.
So magnitude will the same = 5 kg m/s
parallel component = 5 sin 45 = 5/√2 kg m/s
perpendicular component = -5 cos 45 = -5/√2 kg m/s
(- sign comes due to change in direction)

So you can see that there is no change in parallel component.
Only perpendicular component changes.
So change = 5/√2 kg m/s - (-5/√2 kg m/s)
                  = 5/√2 kg m/s+5/√2 kg m/s
                  = 10/√2 kg m/s
                  =5√2 kg m/s


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