## Annieb 3 years ago 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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1. sauravshakya

(A) 4 kg • m/s

2. kartiksriramk

(D) 36 Kg m/s

3. akhil009

ans is 36

4. Yahoo!

(D) 36 Kg m/s

5. sauravshakya

change in momentum = finial momentum - intitial momentum

6. Yahoo!

since it acts in opp direction

7. akhil009

bcuz momentum is vector quantity u can not simply subtract them you have to be care ful with their vector directions|dw:1344183447716:dw|

8. sauravshakya

I think question must specify that one is 20 and other is -16 since momentum is a vector quantity

9. akhil009

|dw:1344183608654:dw|

10. akhil009

@sauravshakya as he said ball is dropped and bounce so you can assume directions

11. sauravshakya

oh ya....