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Physics: Post your doubts here!

A

_Ahmad

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DeViL gURl B) said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_12.pdf

Guys question 15 please !! And 12 as well!!!! 23 as well ! :D
Thank you :)
Click to expand...

for Q15

final k.e - initial k.e = total work done

First situation,

8-4=Fs
4=Fs

second situation we have to find final k.e

final k.e - initial k.e =word done
final k.e -4 = 2F2s
final k.e -4 =4Fs

we know from first situatation that Fs =4

final k.e -4= 4(4)
final k.e = 16+4
final k.e = 20

so answer is B
 
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