A 2.5 kg ball is dropped onto a concrete floor. It strikes the floor with a momentum of 20 kg • m/s and bounces away from the floor with a momentum of 16 kg • m/s. What is the change of momentum of the ball? (A) 4 kg • m/s (B) 8 kg • m/s (C) 32 kg • m/s (D) 36 kg • m/s (E) 40 kg • m/s A 2.5 kg ball is dropped onto a concrete floor. It strikes the floor with a momentum of 20 kg • m/s and bounces away from the floor with a momentum of 16 kg • m/s. What is the change of momentum of the ball? (A) 4 kg • m/s (B) 8 kg • m/s (C) 32 kg • m/s (D) 36 kg • m/s (E) 40 kg • m/s @Physics

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A 2.5 kg ball is dropped onto a concrete floor. It strikes the floor with a momentum of 20 kg • m/s and bounces away from the floor with a momentum of 16 kg • m/s. What is the change of momentum of the ball? (A) 4 kg • m/s (B) 8 kg • m/s (C) 32 kg • m/s (D) 36 kg • m/s (E) 40 kg • m/s A 2.5 kg ball is dropped onto a concrete floor. It strikes the floor with a momentum of 20 kg • m/s and bounces away from the floor with a momentum of 16 kg • m/s. What is the change of momentum of the ball? (A) 4 kg • m/s (B) 8 kg • m/s (C) 32 kg • m/s (D) 36 kg • m/s (E) 40 kg • m/s @Physics

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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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(A) 4 kg • m/s
(D) 36 Kg m/s
ans is 36

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(D) 36 Kg m/s
change in momentum = finial momentum - intitial momentum
since it acts in opp direction
bcuz momentum is vector quantity u can not simply subtract them you have to be care ful with their vector directions|dw:1344183447716:dw|
I think question must specify that one is 20 and other is -16 since momentum is a vector quantity
|dw:1344183608654:dw|
@sauravshakya as he said ball is dropped and bounce so you can assume directions
oh ya....

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