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A body of mass 5 kg starts from the orig...

A body of mass 5 kg starts from the origin with an intial with an intial velocity ` vec (u) = 30hat(i) + 40hat(j).` . If the body collides with a wall and after collision its velocity becomes` vec(v) = - 30 hat (i) + 40 hat (j) ,` then what is change in momentum of body ?

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