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Physics: Post your doubts here!

Hadi Murtaza

Hadi Murtaza

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Thought blocker

Thought blocker

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Hijab said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_12.pdf
Sorry the previous one was incorrect so i deleted it..
Click to expand...
Hadi Murtaza said:
It cannot b A becuz minimum momentum needed 2 stop da ball is 2mv
If it wuz B den da ball wud stop at da wall becuz all momentum wud b removed.
D is wrong becuz momentum is conserved here
C is correct becuz inital p = 2mv , final p = mv , so da ball has lost momentum but it still rebounded :)
Click to expand...
Oh shits I dint read the question properly... Collision is inelastic.
Here you go :)
initial momentum of the ball is 2mv before collision... if collision was perfectly elastic one, all the momentum would have been gained by the ball... and this would have made the change in the momentum equal to 4mv.. 2mv-(-2mv)... now it is given that collision is inelastic, it will lose some of its momentum to the wall.. so now change in momentum will be less than 4mv but cant be less than the initial momentum... so the answer is C.
 
Thought blocker

Thought blocker

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Hadi Murtaza said:
It cannot b A becuz minimum momentum needed 2 stop da ball is 2mv
If it wuz B den da ball wud stop at da wall becuz all momentum wud b removed.
D is wrong becuz momentum is conserved here
C is correct becuz inital p = 2mv , final p = mv , so da ball has lost momentum but it still rebounded :)
Click to expand...
Pf cant be less than Pi in inelastic... don't you think so ? Or I am wrong ?
 
Hijab

Hijab

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Thought blocker said:
Oh shits I dint read the question properly... Collision is inelastic.
Here you go :)
initial momentum of the ball is 2mv before collision... if collision was perfectly elastic one, all the momentum would have been gained by the ball... and this would have made the change in the momentum equal to 4mv.. 2mv-(-2mv)... now it is given that collision is inelastic, it will lose some of its momentum to the wall.. so now change in momentum will be less than 4mv but cant be less than the initial momentum... so the answer is C.
Click to expand...
Thankyou
 
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