A particle of mass m strikes elastically on a wall with velocity v, at an angle 60 degree from the
wall then magnitude of change in momentum of ball along the wall is
a) 0 b) 2mv c)root3*mv d)mv

Answer is mv

Answer is 0

Please find this answer

In this Question you have to take that velocity 60 degree from wall their consider the word" from "so you have to consider the momentum and mv sin theta that is MV sin 60 not signCos60 so don't consider the angle it may be 45 it may be 60 it may be 30 but here consider the word from from means you have to consider the word from So if you consider that word from y axis your answer should be mv no doubt but you have to take theta from x-axis answer will be zero its confirm so take this word from and make a clear diagram so you can understand the correct representation and correct answer of the statement with the statement again and again so that you can find the correct answer