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No Change as such

momentum= mass*velocity
both remain same after collision
so no change in momentum.

Answer is given as 2MV

But how? Are we to add both the momenta?

adarsh see the direction change as well
first it is +v next it is -v

Okay. yeah, got it.
First, Its MV. Second is -MV. Subtracting, we get 2MV.

By subtracting how we get 2MV

But I don't understand why the sign is +ive in first case and -ive in second case.

See, MV - ( - MV) = MV + MV = 2MV(Simple integer addition)

Can anyone say about the signs?

|dw:1329838538143:dw|because we shud maintain a standard sign system like think this way

So, in all physics problems requiring direction, we need to follow Cartesian System, rite?

Ok. Thanks.