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A body of mass M collides against a wall with velocity V and rebounds with the same speed. It's change of momentum is

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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

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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?
yeah there is more than that for that u need to come to 11th for now understand that when it is a 1-dimensuional(straight line motion) follow the co-ordinate axes
Ok. Thanks.

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